Questions on Geometry: Triangles answered by real tutors!

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Question 10304: Need the formula to find the perimeter of a triangle

Click here to see answer by rapaljer(4671)

Question 10255: The question I was given was: Suppose you have and equilateral triangle with a height of h feet. What is its area?
I know I have to use the Pythagorean Theorem but I don't know how to do this without knowing another side. Do you have any suggestions?
Click here to see answer by Earlsdon(6294)

Question 11298: what is the formual for the area of a triangle?
Click here to see answer by prabhjyot(165)

Question 12114: WHAT IS THE FORMULA FOR A TRIANGLE WHEN YOU HAVE THE LENGTH OF 2 SIDES AND YOUR
TRYING TO FIND THE OTHER SIDE?
Click here to see answer by rapaljer(4671)

Question 12298: if a plane contains 20 points no three of which are collinear how many different triangles can be formed using these points
Click here to see answer by askmemath(368)

Question 11972: How do you find perimeters for triangles. I managed to get some of them by measuring, but I want to know how you actually find the perimeter.
Click here to see answer by bonster(299)

Question 12439: If there was an right-angle triangle, and I wanted to find out the lengths of the 2 unknown sides, by using the pthagoreom theorem, it would be A(squared)+B(squared)=6(squared). Is it possible, if so how, to find the lengths of A and B of they were the same lengths?
Click here to see answer by Earlsdon(6294)

Question 12656: An isosceles triangle with a base of 5cm has a perimeter of 30cm.How long are each of the other two sides?
Click here to see answer by AdolphousC(70)

Question 13270: One of two supplementary angles measures 37 degrees less than four times the other. Find the measure of each angle.
Click here to see answer by bam878s(77)

Question 14039: the first side of a triangle is 5 more than 3 times the third side. the second side is 5 less than twice the third side. if the perimeter is 60cm, how long is each side?
Click here to see answer by bam878s(77)

Question 14038: the first side of a triangle is 3cm longer than the second side. the third side is twice the second side. if the perimeter is 59cm, what is the length of each side?
Click here to see answer by bam878s(77)

Question 14701: Here is my question:
The hypotenuse of a right triangle is 15cm. Find the lengths of the sides of the triangle if one side is 3 cm longer than the other.
I came up with this formula: 15^2=x^2+(x+3)^2
Then I get x^2+x^2+6x+9 = 225
2x^2+6x+9 = 225

Then I am lost. Please help!

Click here to see answer by Earlsdon(6294)

Question 14649: You have a triangle with sides 6, 7 and x. What is the maximum that x can be and why?
Click here to see answer by venugopalramana(3286)

Question 15004: If the hypothenuse of a right tiangle is known is it possible to determine the lengths of the other two sides?
Click here to see answer by longjonsilver(2297)

Question 15322: I have an isosceles triangle with a 45deg angle between. What is the formula for finding the length of the third side?
Click here to see answer by tubby482(2)

Question 15494: One of two complementary angles measures 30� more than three times the other. What is the measure of BOTH angles?
Click here to see answer by venugopalramana(3286)

Question 15491: One of two supplementary angles measure 30� less than two times its supplementary angle. What is the measure of both angles?
Click here to see answer by venugopalramana(3286)

Question 15869: the isosceles triangle has a height of 24 inches.Sides xy and yz are each 26 inches long.what is the length of the base?
Click here to see answer by kunal_122(19)

Question 15868: the hypotenuse of a right triangle measures 13 feet and one measures 5 feet. find the lenght of the other leg?
Click here to see answer by pwac(253)

Question 15868: the hypotenuse of a right triangle measures 13 feet and one measures 5 feet. find the lenght of the other leg?
Click here to see answer by vasu2qute(17)

Question 16962: A man is standing 150 ft from the base of a tower. The angle is 62 degrees. How tall is the tower? We know that this is a right triangle. Can you find the hypotenuse if you know the angles and only one side?
Click here to see answer by Earlsdon(6294)

Question 17102: please help me with similar triangles
ABC and DEF are similar What is the remaining side of a=10, d=12,c=6,d=6
Click here to see answer by venugopalramana(3286)

Question 17583: given a square or rectangle what is the formular for calculating the diagonal size
Click here to see answer by pwac(253)

Question 17633: Determine the measure of angle "a"
I have one corner that is labeled 108* (top right) and the other corner (bottom left) is labeled 162*. The right hand (bottom right) corner is labeled "a"
It is my understanding that this must add up to 180*. But, you have to remember that I really do not understand this at all.
Click here to see answer by whisper(27)

Question 17711: In an isosceles triangle, the length of one of the equal sides ie three times the length of the third side. The perimeter is 21 m. Find the length of each side.
Click here to see answer by xcentaur(357)

Question 17708: In an isosceles triangle, the third side is 50% of the length of one of the equal sides. Find the length of each side when the perimeter is 125 ft.
Click here to see answer by xcentaur(357)

Question 17499: I have an equilateral triangle with an area of 30 square centimeters. I need to find the base and height of the triangle.
Click here to see answer by xcentaur(357)

Question 18287: If I know the length of two sides of a triangle, how do I find the length of the third side?
Click here to see answer by Earlsdon(6294)

Question 18321: In triangle ABC, AB is 9cm shorter than AC, while BC is 3 cm longer than AC. If the perimeter os ABC is 48cm, what are the lengths of the three sides? Let x represent AC.
This question is similiar to question #14038 but I couldn't get the formula to work for me.
Click here to see answer by venugopalramana(3286)

Question 18417: NAME THE ANGLE THAT IS ADJACENT TO ANGLE JLM IN TRIANGLE
Click here to see answer by mmm4444bot(95)

Question 18580: The altitude to the base of an isosceles triangle _______ longer than a leg of the triangle.
a)must be
b)may be
c)cannot be
Click here to see answer by Alwayscheerful(414)

Question 18581: The sum of the lengths of the sides of an equilateral triangle _______ longer than the sum of the lengths of the altitudes of the triangle.
a)must be
b)may be
c)cannot be
Click here to see answer by khwang(438)

Question 19208: if A(1,5), B(3,-2), and C(-3,0), find the measure of the sides of triangle ABC. Then classify the triangle by it's sides.
Click here to see answer by venugopalramana(3286)

Question 19207: if triangle ABC is an isosceles triangle, aangle B is the vertex angle, AB=6x+3 BC=8x-1 and AC=10x-10 find x and the measures of each side of the triangle
Click here to see answer by venugopalramana(3286)

Question 19257: Triangle ABC has area 240. Points X,Y,Z lie on sides AB,BC, and CA, respectively. Given that segment AX/BX=3, BY/CY=4, CZ/AZ=5, find the area of triangle XYZ.
Click here to see answer by khwang(438)

Question 20644: I have balanced a weightless beam, ten meters long, on a fulcrum by putting a 6 kg mass on one end, and an unknown mass on the other end. To balance this, I had to place the fulcrum 1.5 meters from the 6kg mass. What is the unknown mass?

Click here to see answer by Paul(988)

Question 20676: What are pythagorean triples and how would you answer this question:
Which set could not represent the lengths of the sides of a triangle?
Click here to see answer by elima(1433)

Question 20859: Given the coordinates of the midpoints of the sides of a triangle find the coordinates of the vertices of the triangle.
Midpoint Coordinates:
L(-2,1)
M(2,3)
N(3,-2)
I know that you can plot the coordinates and then draw in the triangle and find the coordinates of the vertices that way, but I was wondering if there was an easier or mathematical way to go about solving the problem. Thank you for looking this over.
Click here to see answer by venugopalramana(3286)

Question 20815: The lengths of two sides or a triangle are 7 and 10. The length of the third side may be:
a)17 b)20 c)3 d)8
Click here to see answer by venugopalramana(3286)

Question 21347: can the angles in a triangle have the measures given?43degrees,48degrees,90degrees #2 21.3degrees,56.7degrees,102degrees
Click here to see answer by venugopalramana(3286)

Question 21343: You are enclosing a triangular playground with fence. You have measured two sides of the playground to be 100 feet and 200 feet. What is the maximum total length of fence that you need?
Click here to see answer by venugopalramana(3286)

Question 21412: This is a geometry question, from my algebra class, we are working on quadatric equations. Iam so confused. I know the formula for area of a triangle. A = 1/2 b x h. But can't figure out how to come up with an equation to figure out how to do this.
The question:
The base of a triangle is 4 feet less than 3 times the height, and the area is 16 square feet. Find the dimensions of the triangle (Note: need to set up an equation to sove the problem) Please help!! Thank you.
Click here to see answer by josmiceli(19441)

Question 21164: I need help with this problem:
The area of a triange is 90 square feet. The height is 2 less than twice the base. Find the base and height of the triangle.
So, A=90 sq ft and the area of a triangle is 1/2 x B x H. The height of my triangle is going to be 2b-2. Here's where the problem is...I don't know what to do next or how to find what my base is. Any help will be great. Thanks!!
Jenny
Click here to see answer by bonster(299)

Question 21529: I have a yard that is a triangle. My sides measure 110 ft by 120 ft by 150 ft. If 1 bag of fertilizer covers 1200 square ft. how many bags will I need to cover the yard?
Click here to see answer by Earlsdon(6294)

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