Posted by audrey on Tuesday, May 17, 2011 at 8:29pm.
a triangular road sign has a height of 8 feet and a base of 16.5 feet. How much larger in area is this sign than one with a height of 4 feet and a base of 8.25 feet?
Please fully explain how you got this cause i'm really confused!!!

math!!  Reiny, Tuesday, May 17, 2011 at 8:36pm
since the sides of the two similar road signs are in the ratio of 2 : 1
so their areas are proportional to the square of their sides
2^2 : 1^2 = 4 : 1
so the second is 4 times larger.
You could do it the long way, and actually calculate their areas. You will find the the first answer is 4 times the second answer.

math!!  Ms. Sue, Tuesday, May 17, 2011 at 8:37pm
Triangle area:
A = bh/2
A = (16.5 * 8)/2
A = 132/2
A = 66 square feet
Find the area of the smaller triangle the same way.

math!!  audrey, Tuesday, May 17, 2011 at 8:50pm
thank you Reiny and Ms. Sue!! I wouldn't be able to make it through my math class without you!

math!!  Ms. Sue, Tuesday, May 17, 2011 at 8:53pm
You're welcome, Audrey.
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