Question

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

Answer 1

⬛ TASK : TO FIND THE AREA
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⏩ HERE, A = 20 cm, B = 20 cm,
C = 20cm

⏩ S = A + B + C / 2

⏩ S = 20 + 20 + 20 / 2

⏩ S = 60 / 2

⏩ S = 30 cm

⏩ AREA = √S(S-A) (S-B) (S-C)

⏩ AREA = √30(30-20) (30-20) (30-20)

⏩ AREA = √30 × 10 × 10 × 10

⏩ AREA = √30000

⏩ AREA = 173.205 cm^2
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⏩ HOPE IT HELPS

⏩ HAVE A NICE DAY MY FRIEND

Answer 2

Area of equilateral triangle = √3/4 × (side)^2

Side of equilateral triangle = 20 cm

So, Area = √3/4 × (20)^2
= √3/4 × 400
= √3×100

Hence, √3 = 1.73205081
so. √3×100 = 173.205081

Then, Area of equilateral triangle = 173.205081 cm^2

Hope it helps..!!!
Cheers...!!!