Question

find the area of an equilateral triangle whose sides are 20 cm each

Answer 1

area of equilateral triangle = √3/4× (side)^2
= √3/4×400
=100√3

Answer 2

Given :-

• Side of equilateral triangle is 20 cm each.

To Find :-

• The area of equilateral traingle = ?

Answer :-

• The area of equilateral traingle = 100√3 cm²

Explaination :-

→ Area of equilateral traingle = √3/4 × (side)²

→ Area of equilateral traingle = √3/4 × (20)²

→ Area of equilateral traingle = √3/4 × 400

→ Area of equilateral traingle = √3 × 100

→ Area of equilateral traingle = 100√3 cm²

Therefore,the area of equilateral triangle is 100√3 cm².

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Extra Shots :-

• Volume of cylinder = πr²h
• T.S.A of cylinder = 2πrh + 2πr²
• Volume of cone = ⅓ πr²h
• C.S.A of cone = πrl
• T.S.A of cone = πrl + πr²
• Volume of cuboid = l × b × h
• C.S.A of cuboid = 2(l + b)h
• T.S.A of cuboid = 2(lb + bh + lh)
• C.S.A of cube = 4a²
• T.S.A of cube = 6a²
• Volume of cube = a³
• Volume of sphere = 4/3πr³
• Surface area of sphere = 4πr²
• Volume of hemisphere = ⅔ πr³
• C.S.A of hemisphere = 2πr²
• T.S.A of hemisphere = 3πr²