Homework Help: math Ms. Sue

Posted by Deborah on Thursday, November 8, 2012 at 2:50pm.

A right triangle has an area of 13 m2. The dimensions of the triangle are increased by a scale factor of 3. What is the area of the new triangle?
39 m2
169 m2
117 m2
142 m2

I think it is A...?

math Ms. Sue - Steve, Thursday, November 8, 2012 at 3:01pm
nope. If each dimension is scaled by three, the area is scaled by 3^2, so (C).

recall that the area

a = 1/2 bh

If b and h are replaced by 3b and 3h, then

new area
A = 1/2 (3b)(3h) = 1/2 9bh = 1/2 bh * 9, or 9a
math Ms. Sue - rage, Friday, December 7, 2012 at 1:34am
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