Question

What is the length of side A in the new parallelogram?

2 cm

9cm

90cm

162 cm

Answer 1

You just need to write a proportion between the correspondent sides:

`45/ 5=18/ A`

Now, since 45 is 9 times 5, 18 must be 9 times A, and thus A must be 2.

Even if we didn't realize that, we can solve for A the usual way:

`45A=5\cdot 18 \iff A=(5\cdot 18)/(45)=(90)/(45)=2`

Answer 2

A.

Explanation:

The person's question up above is A. I'm just putting it short. ;)