**Which of the following is /are true?**

A. Attitude is required for calculating area by heron’s formula.

B. Attitude is not required for calculating area by heron’s formula.

C. Semi-perimeter is required for calculating area by heron’s formula.

D. Semi-perimeter is not required for calculating area by heron’s formula.

## Answer

**B and C**

## Explanation

By Heron’s formula,

**Area = √s(s-a)(s-b)(s-c)**,

Where s = semi – perimeter and a, b, c are side lengths

Semi-perimeter = sum of side lengths/2

**So, only the semi-perimeter and the side lengths are required.**