Question

1. A ABC is an equilateral triangle. If AB = 30 cm, then find the area of A ABC using
Heron's formula.​

Answer 1

Answer:

389.71 cm^2 or

Step-by-step explanation:

by heron's formula

S= (30+ 30 +30)/2

A=

$\sqrt{45 \times (45 - 30) \times (45 - 30) \times (45 - 30)} \\ = \sqrt{45 \times 15 \times 15 \times 15 } \\ = \sqrt{15 \times 3 \times 15 \times 15 \times 15} \\ = 15 \times 15 \sqrt{3} \\ = 225 \sqrt{3} \\ = 389.711$

since formula for A = root(s×(s-a)×(s-b)×(s-c))

ya can approximate it , for easier answer if ya want .