Question

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Calculate the area of an equilateral triangle, whose height is 20 cm.​

Answer 1

Answer:

we know that AB=AC=BC=20.

This means that the height cuts AB in two equals parts, AH and HB, each 10 units long.

This means that, for example, AHC is a right triangle with AC=20 and AH=10, so

CH=√AC2−AH2=√202−102=√300=10√3

Since we know the base and the height, then the area is

20⋅10√32=100√3 cm

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Answer 2

Step-by-step explanation:

in equilateral triangle

all sides are equal

hence

base =20

height = 20

1/2×20×20

200is the answer