# Questions on Geometry: Geometric formulas answered by real tutors!

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 Geometric and Other Formulas Answers archive In Depth

 Question 155963: how to write these word problems into numbers? 1)two hundred seventeen thousand,eight 2)one hundred thousand,fifty-nine 3)nineteen hundred Click here to see answer by Alan3354(31518)

 Question 141787: A circle centered at the point of origin has a radius of 10. If the point (10,0) is rotated 120 degrees counter-clockwise, determine the coordinates of the new point in exact radical form. Click here to see answer by Alan3354(31518)

 Question 156958: Write a rule for the nth term of the geometric sequence: a3=180,a6=38,880 Click here to see answer by scott8148(6628)

 Question 157294: Find the radius of a cylinder with a height of 8 cm and a surface area of 96(pi)cm^2. Click here to see answer by jojo14344(1512)

 Question 157889: Find the area under the normal distribution curve to the right of z = –1.03. Can you explain this for me? Click here to see answer by Fombitz(13828)

 Question 158186: Can you help me figure this out. I am trying to help my daughter learn some of this and have lost most of what I learned. The coordinates of A, B, C, D are 8, -9, 17 and -14 respectively. Determine AB, BC, CD, and AD. Click here to see answer by gonzo(654)

 Question 158756: I know the formulas for finding the surface area of a sphere and the volume of a sphere. I need to use these formulas to find out the algebraic formula for the ratio of a sphere's surface area to its volume AND show logical steps on how I got it. Click here to see answer by scott8148(6628)

 Question 158809: Hi, My question is about finding a measure in simplest form. I have to use the distance formula. The coordinates are (-5,3) and (3,4. The answer I got for that question was 65. Now I have to simplify the answer and I'm not sure what to do. Thank You Click here to see answer by checkley77(12569)

 Question 159125: Im having a brain fart. Im trying to solve 3+9+27+..., find S10 tn=3+(10-1)(is 3 to power of 3?) I can't remember the rule for multiplying.Please help! t10=12(?) t10= s10= [n(t1+tn)/2] Click here to see answer by Alan3354(31518)

 Question 159312: Need help on the following problem please? problem: determine which variable you will substitute for and rewrite as an equation using one variable? x + y =6 2x - 3y =9 Click here to see answer by gonzo(654)

 Question 159400: What is the formula to find out what the some of all of the interior angles in a non regular pentagon? Click here to see answer by vleith(2825)

 Question 159513: 2 for the function f(x)=3x - 2x + 5, find f(1), f(-2) and f(a). Click here to see answer by jim_thompson5910(28708)

 Question 160470: Write the equation of a parallel line to y=16x-14 going through (2,-2). Click here to see answer by checkley77(12569)

 Question 161357: useing a mid-point formula Line AB is located (-5,0) and (-1,3).what slope is a) 4/3 b) 2/4 c) 3/4 d) 4/2 Click here to see answer by checkley77(12569)

 Question 161674: 1) there is a circle with a 24" diameter. 2) There is a line drawn across the circle six inches from the bottom. 3) What is the area under the line? 4) figure this problem out without using the formula to find the area under a curve. 5 Good luck! Click here to see answer by gonzo(654)

 Question 161749: My husband and I are building a semi-circular wall in our landscaping. We have 12x12 inch blocks that we need to cut in order to place them on top of the wall. If the radius of our semi-circle is 78 and 5/16 inches at what angle should we cut each of our blocks to form the semi-circle? Click here to see answer by scott8148(6628)

 Question 162344: i need to solve the equation: y1-y2/x1-x2 in terms of y1 Click here to see answer by Alan3354(31518)

 Question 162533: The length of a rectangle is 4 times the width. The perimeter of the rectangle is 120. What are the length and width of the rectangle? Click here to see answer by checkley77(12569)

 Question 163219: In the problem I'm working on, I have to draw a scalene triangle with set side lengths, but the book doesn't tell me the angle measures, which would make the problem a lot easier. We haven't learned a formula to calculate angles from side lengths in class yet, so I'm wondering if you know, because I've encountered problems like this before, and wondered if there's an easier way. Thanks for your help! Click here to see answer by scott8148(6628)

 Question 163915: find the volume of a frustum of a cone with bases of radii 5cm and 19cm. The height of this frustum is 6cm. Click here to see answer by orca(409)

 Question 164005: Prove that the area of a circular sector of radius r with central angle theta is , where theta is measured in radians. The following is what I've come up with so far, am I on the right track? I can tell that a circular sector looks similar to a triangle with an arc replacing its flat base. The area of a triangle is computed using A=1/2bh. Therefore: h=r b=s=r(theta) A=(1/2)rr(theta) which is simplified to Click here to see answer by Alan3354(31518)
 Question 164005: Prove that the area of a circular sector of radius r with central angle theta is , where theta is measured in radians. The following is what I've come up with so far, am I on the right track? I can tell that a circular sector looks similar to a triangle with an arc replacing its flat base. The area of a triangle is computed using A=1/2bh. Therefore: h=r b=s=r(theta) A=(1/2)rr(theta) which is simplified to Click here to see answer by Dr.E(1)

 Question 164311: The width of a rectangle is 22 centimeters shorter that its length. The perimiter of the rectangular is 160. find its length. Click here to see answer by algebrapro18(206)
 Question 164311: The width of a rectangle is 22 centimeters shorter that its length. The perimiter of the rectangular is 160. find its length. Click here to see answer by stanbon(57962)

 Question 164934: Write an equation for the line parrallel to XY that contains Z. XY: 6x-10y+5=0, Z(-5,3) Click here to see answer by Mathtut(3670)

 Question 166476: how do u find out the volume of an object if you know the mass and density? Click here to see answer by jojo14344(1512)

 Question 167027: Find the area of a cement walk 3 feet wide that surrounds a rectangle plot of ground 44 feet long and 44 feet wide. Click here to see answer by checkley77(12569)

 Question 167029: One number is 2 larger than another number. The sum of their squares is 100. Find the numbers. Click here to see answer by checkley77(12569)

 Question 167030: In an office building, a room contains 54 chairs. The number of chairs per row is three less than twice the number of rows. Find the number of rows and the number of chairs per row. Click here to see answer by ptaylor(2052)

 Question 167280: I need to solve for x 4x - 3 over 4 = 5x + 1 over 5 Click here to see answer by Mathtut(3670)

 Question 167319: Robert has 4 red flags, 3 blue flags, and 2 white flags. How many 9-flag signals can he run up a flagpole? Click here to see answer by stanbon(57962)

 Question 167281: Solve for x 3/4(x + 2) - 3 = 5/6(2x) Click here to see answer by aswathytony(47)

 Question 167334: how could you tell which is congrunet or not Click here to see answer by midwood_trail(310)