Question

A triangle has length of one side 20mm and two angle of each 60 degree. Find the area of triangle? The correct answer is 100√3

Answer 1

Answer:

Area of an equilateral triangle =

$( \sqrt{3}a {}^{2} ) \div 4$

Where a is the side of the triangle

So a = 20mm

= (root3 × 20 ×20)/4

= 400(root3)/4

= 100(root3)

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