If base perimeter = 40 cm, slant height = 10 cm, what is lateral surface area of square pyramid?

Correct option is B

Given :

Base perimeter of square pyramid = 40 cm
Slant height = 10 cm

Formula Used :
Lateral surface area (LSA) of a pyramid
​$$\text{LSA} = \frac{1}{2} \times (\text{Perimeter of base}) \times (\text{Slant height})$$​​
Solution :

$$\text{LSA} = \frac{1}{2} \times 40 \times 10 \\ \ \\\text{LSA} = 200 \text{ cm}^2$$​​