Question

2. Find area of an equilateral triangle whose perimeter is 15 Cm.​

Answer 1

Answer:

area =10.83

Step-by-step explanation:

Answer 2

Answer:

Area of triangle =

$\sqrt{s(s - a)(s \: - \: b)(s \: - \: c)}$

where a ,b and c are sides of triangle and s= (a+b+c)/2

Side of the equilateral triangle = 5 cm

Area of triangle =

$\sqrt{(15 \div 2) {(15 \div 2 - 5)}^{3} }$

= root {5/2 × 5/2 × 5/2 × 5/2 ×3}

= 25/4 root 3

$6.25 \sqrt{3}$

This is heron's formula. Mark me brainliest