# math Ms. Sue

posted by .

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 -

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 -

177

• math Ms. Sue -

yaya its 177 :D

• math Ms. Sue -

Thanks guys

## Similar Questions

1. ### algebra, HELP!

9. The sides of a rectangle are increased by a scale factor of 4. The perimeter of the smaller rectangle is 20 cm. What is the perimeter of the larger rectangle?
2. ### math

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?

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?
4. ### math

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?
5. ### Math

Triangle A has an area of 19,00cm squared and similar triangle B has an area of 118.75cm squared. Determine what scale factor makes triangle B an enlargement of triangle A
6. ### Math algebra Help please

A right triangle has an area of 24 ft^2 the dimensions of the triangle are increased by a scale factor of 6 A.48ft^2 B.72ft^2 C.144ft^2 D.864ft^2