Formula is 2(wl+hl+hw)
2[(7x20)+(15x20)+(15x7)]
=1090 cm^2
Answer:
answer C.
Step-by-step explanation:
it has the most logical explanation, frankly I'm not the best with circles, but I'm decently sure I'm right
ANSWER:
We have to find new side-lengths of PQR triangle.
Original sides are.

After multiplying by 2.5 we get

These are the new sides of the P'Q'R' triangle.
8 inches = 1/8 of the real height of the book shelf
Multiply 8 by 8 because the question shows 1/8 of the book shelf
8x8=64
The book shelf is 64 inches.
Or 5 feet and 4 inches.