Question

Help me answer number 9 correctly.

Answer 1

A, F

Explanation:

The perimeter of a polygon is equal to the sum of all side lengths.

We have the side lengths

`s,\ s+(1)/(2),\ s,\ s+(1)/(2)`

The perimeter:

`s+s+s+(1)/(2)+s+(1)/(2)=(s+s+s+s)+\left((1)/(2)+(1)/(2)\right)=4s+1\\\\4s+1=(2)(2s)(2)\left((1)/(2)\right)=2\left(2s+(1)/(2)\right)`