Question

36. The area of an equilateral triangle of
side 40 cm is
(1) 100/3 cm
2
(2) 160/3 cm?
(3) 2003 cm?
(4) 40073 cm
?​

Answer 1

$\bigstar$ Question :

$\mapsto$The area of an equilateral triangle of side 40 CM is?

$\bigstar$To Find :

$\mapsto$Area of an equilateral triangle = ?

$\bigstar$Given :

$\mapsto$Side = 40 cm

$\bigstar$Required Formula :

$\mapsto$$\bf{Area \:of \:an \:equilateral \:triangle\: = \frac{\sqrt{3}}{4} a^{2} }$

$\bigstar$Solution :

$\mapsto{ \frac{ \sqrt{3} }{4} \times 40 ^{2} }$

$\mapsto \frac{ \sqrt{3} }{4} \times 40 \times 40$

$\mapsto \frac{ \sqrt{3} }{4} \times 1600$

$\sqrt{3} = 1.732$

$\mapsto \: \frac{1.732 \times 1600}{4}$

$\mapsto \frac{2771.2}{4}$

$\mapsto \: 692.8cm$

___________________________________

Answer 2

Area of equilateral triangle is √3/4 a²

√3/4 x ( 40 ) ²

√3/4 x 1600

√3 x 400

❥ Value of √3 = 1.732

1.732 x 400

692.8 cm ➡ Answer