Question

Find the area of equilateral triangle whose side is 40cm​

Answer 1

Step-by-step explanation:

Area of equilateral triangle

= 40cm × 3 sides

= 200cm

Answer 2

$\sf \purple{Area \: of \: equilateral \: \triangle = \frac{ \sqrt{3} }{4} \times ({side})^{2} }$

$\sf {Area \: of \: equilateral \: \triangle = \frac{ \sqrt{3} }{4} \times ({40})^{2} }$

$\sf {Area \: of \: equilateral \: \triangle = \frac{ \sqrt{3} }{ \cancel4} \times \cancel{40} \times 40}$

$\sf {Area \: of \: equilateral \: \triangle = \sqrt{3} \times 10 \times 40 }$

$\sf{\pink{ \underline{ \underline{Area \: of \: equilateral \: \triangle = 400 \sqrt{3} \: {cm}^{2} }}} }$