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Geometry: Parallelograms

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Question 16774: Can someone help me with this problem? The base of a parallelogram is 10 cm long, the height is 5cm, and the longer diagonal is 13cm long. How long is the shorter diagonal? First I used the pythagorean theorem c2=a2+b2....c=13cm, a=?, b= 5cm.....from there I am still confused please help...Thank you!
Click here to see answer by rapaljer(3622)

Question 19302: GIVEN THE FOLLOWING INFORMATION, DETERMINE WHICH LINES, IF ANY, ARE PARALLEL. STATE THE POSTULATE OR THEOREM THAT JUSTIFIES YOUR ANSWER.

Click here to see answer by MelanieBCC(40)

Question 22677: Decide if the following statements are true or false.
Every triangle is convex.
If quadrilateral wxyz is regular then it hs four right angles.
Its is not possible to draw a concave quadrilateral.
All of the diagonals of a regular polygon are congruent.
Click here to see answer by papiochik07(2)

Question 22702: In a two collumn proof, how would you show the diagonals of a trapezoid make the two bases parallel without using the obvious?

Thanks a bunch
Click here to see answer by stanbon(26285)

Question 23675: Can not figure out how to solve the following. I am to find the value of x and y to ensure the quadrilateral is a parallelogram. there is a square with x from corner to corner. in top triangle right side says 7x in bottom triangle right side says y + 2 right triangle is empty. Left side triangle has 4x on top line and 2y on bottom... Please help!
Click here to see answer by venugopalramana(3286)

Question 23699: How many different quadrilaterals can you make from a set of four side lengths?
Click here to see answer by venugopalramana(3286)

Question 23697: What combinations of side lengths will always give a parallelogram? A rectangle? A square?
Click here to see answer by venugopalramana(3286)

Question 25382: This problem is under Chapter 5, pg. 194 #32 in a Houghton Mifflin Math book. It is really hard,and I am desperate for help.
There is a figure drawn with Trapezoid ABCD with Median MN. Then there are diagonals AC and DB with the Intersecting points, E and F, respectively. The problem is: If DC=3x, AB=2xsquared, and EF=7, find the value of X.
Please Help!!!!!!
Click here to see answer by venugopalramana(3286)

Question 25605: find the surface area of a square pyramid with a base of 2 yds and a slant ht of 2 yds.
Click here to see answer by longjonsilver(2297)

Question 25983: If AD is 10 units, AB is 8 units and AC is 12 units what is the measure of EC?
Click here to see answer by atif.muhammad(135)

Question 26134: a square with one side that measures 5 1/2 inches. I don't get the whole P=2(lxw) thing....please help!
Click here to see answer by stanbon(26285)

Question 27977: could you please help me.
DIRECTIONS:
determine whether the given vertices represent a parallelogram,rectangle,rhombus,or square.explain your reasoning.
A(-3,0)B(-1,3)C(5,-1)D(3,-4)
Click here to see answer by venugopalramana(3286)

Question 29203: how do you find the area of trianles and trapezoids
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Question 29781: find the fourth vertex of three coordinate points (0,10) (30,10) (20,-30)find fourth point. how many other points could be vertex?
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Question 30806: how do u solve -2x+6=x+12
Click here to see answer by troyapplehelen(46)

Question 31171: Hello! This problem is very confusing for me. I know that a parallelogram has two pairs of congruent sides (bxh), however this problem is not making sense.
Find the area of a parallelogram whose sides are 6 inches and 8 inches and whose longer diagonal is 12 inches.
I would really appreciate any help solving this problem. I've tried drawing a picture and everything, but nothing has worked. Thank you for your time.
Click here to see answer by longjonsilver(2297)

Question 31180: Hello! I have a question concerning the following problem. I know your supposed to use the COS formula however I do not know how to approach that method. Could you show me step -by- step?
Find the area of a parallelogram whose sides are 6 inches and 8 inches and whose longer diagonal is 12 inches.
Thank you so much!
Click here to see answer by longjonsilver(2297)

Question 31182: Hi I'm back. Thank you so much for your help. However I'm having problems plugging in the numbers into the COS formula.
Find the area of a parallelogram whose sides are 6 inches and 8 inches and whose longer diagonal is 12 inches.
Could you show me how to plug in the numbers and find the area. Thank you so much.
Click here to see answer by venugopalramana(3286)

Question 33686: I HOPE YOU CAN HELP
1.FIND THE AREA OF A PARALLELOGRAM 6.2 CM HIGH WITH A BASE OF 5 CM
2. FIND THE TOTAL AREA OF THE OUTSIDE SURFACE OF A CYLINDER 54CM IN DIAMETER AND 75 CM IN HEIGHT

I WAS WONDERING IF I DID THIS ON RIGHT
WHAT IS THE COMPLEMENT OF AN ANGLE MEASURING 61 DEGREES
90-61=29 DEGREES
Click here to see answer by sarah_adam(201)

Question 35458This question is from textbook Geometry
: The area of a parallelogram is 2x^2 + 9x + 4 cm^2
If the length of the base is 2x + 1 cm, find the length of the altitude.
This question is from textbook Geometry

Click here to see answer by Nate(3495)

Question 38097: if a rhombus is inscribed in a circle, does that mean the diagonals would be congruent?
Click here to see answer by fractalier(1804)

Question 38258: if a rhombus is inscribed in a circle, would that make the diagonals congruent?
Click here to see answer by fractalier(1804)

Question 38284: The bases of an isosceles trapezoid are of lengths 12 and 28. The area is 300. Find the length of a diagonal. i keep working this one and getting the square root of 1009. i think i tried to use the pythagorean theorem after finding the height which i found to equal 15.
Click here to see answer by fractalier(1804)

Question 42243: I got to find the constand of variation k

m varies directly with n; m=144 when n = 8
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Question 42957: Are the following lines parallel, perpendicular, or neither?
L1 with equation x - 6y = 24
L2 with equation 6x + y = 6
Click here to see answer by fractalier(1804)

Question 43074: How can I explain to a few students the differences between a Triangle and Parallelograms?
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Question 43074: How can I explain to a few students the differences between a Triangle and Parallelograms?
Click here to see answer by prabhjyot(164)

Question 44794: Area of a parallelogram. Find a trinomial that represents the area of a parallelogram whose base is 3x + 2 meters and whose height is 2x + 3 meters.
Click here to see answer by AnlytcPhil(958)

Question 50163: graphing:
use slopes to determine if points (-5,-2)(-3,1)(3,0)(5,3) are the vertices of a parallelogram
Click here to see answer by venugopalramana(3286)

Question 51983This question is from textbook discovering geometry an investigative approach

: what are some members of the parallelogram family?This question is from textbook discovering geometry an investigative approach

Click here to see answer by rapaljer(3622)

Question 52904: The points (5,2), (2,6), and (-8,-3) are three vertices of a parallelogram. Locate and give the coordinates of a fourth vertex. Find all possible solutions.
Click here to see answer by venugopalramana(3286)

Question 52877: Is a rectangle a parallelogram?
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Question 53557: (2, -7),y=x-2
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Question 54418: How do I prove that DEFG is a parallelogram? When Quadrilateral DEFG has vertices d(a,b) E(a+c,b)F(a+c+d,b+e)G(a+d,b+e).
Click here to see answer by venugopalramana(3286)

Question 56886This question is from textbook

: Determine the vertex of y=x^2-8x+22This question is from textbook

Click here to see answer by ankor@dixie-net.com(6693)

Question 56887This question is from textbook

: Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x)This question is from textbook

Click here to see answer by stanbon(26285)

Question 56885This question is from textbook

: Find the point on the positive y-axis that is a distance 5 from the point P(3,4).This question is from textbook

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Question 56884This question is from textbook

: Find the midpoint of the line segment from A(-2,9) to B(4,5).This question is from textbook

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Question 57286: A parallelogram has 4 sides where opposite sides are equal. One angle is 60 and the other angle is 120. The problem says solve for x and x is opposite the 120 angle. The answer says that it is 60, but I think that it is 120. Who is right? If you opposite angles are equal then it is 120 and the sheet is wrong. But if you take x+60+120+2x=360, x=60. HELP!
Click here to see answer by venugopalramana(3286)

Question 57824: construct a paralellogram ABCD in which BC=5.5cm, CD=2.5cm and angle ABC=60 degrees. Measure AC and BD
Click here to see answer by venugopalramana(3286)

Question 58885: Determine the point A(x,y) so that the points A(x,y), B(0,3), C(1,0), D(7,2) will be the vertices of a parallelogram.
Click here to see answer by venugopalramana(3286)

Question 25981: IF AE=8x-3 and ec=6x+7, then AC=?
Click here to see answer by Nate(3495)

Question 61361This question is from textbook
: Find the area of this parallelogram.
12ft wide,9ft inside heightwith vertical line.This question is from textbook

Click here to see answer by checkley71(8405)

Question 62019This question is from textbook
: Parallelogram ABCD has vertices at A(-1,x-1), B(x,x+1), C(3,1), and D(x-2,-1). Use the slopes of line AB and line CD to find X.This question is from textbook

Click here to see answer by venugopalramana(3286)

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