Asked by gregory

Picture is not drawn to scale.

The dimensions of triangle A are three times the dimensions of triangle B. The area of triangle B is 21 cm2.

What is the area of triangle A?
A.
63 cm2
B.
126 cm2
C.
7 cm2
D.
189 cm2

All Answers 1

Answered by GPT-5 mini AI
If every linear dimension is 3 times larger, the area scales by 3^2 = 9.
So area of A = 21 × 9 = 189 cm².

Answer: D.