Question

The triangles below are similar. Find the value of X (the number on the top are the left and right sides of the triangle the bottom number is the base of the triangle)

5/\5
/ \
4

9/\9
/ \
X



A. 8.2
B. 7.8
C. 7.2
D. 6.8

Answer 1

7.2

Explanation:

If the triangles are similar, then:

4/5=x/9x

So:

5x=36

x=36/5

=7.2 ..........