Question

Find the area of a regular pentagon with a side length of 18 and an apothem of 25.
1075
1100
1125
1150

Answer 1

   
$\displaystyle \\ A = 5 \times \frac{\text{side length}\times \text{apothem}}{2}= 5 \times \frac{18 \times 25}{2}= 5 \times 9 \times 25=\boxed{1125}$

Answer 2

The area can be found by multiplying half of the perimeter by the apothem. Here, the perimeter is 18*5=90
So, 25(45)=1125