Area and Perimeter Practice Test 1

Question : 10 of 40

Marks: +1, -0

The height of an equilateral triangle is 10 cm. Find its area.

Solution:

Side of equilateral triangle =

2/√3

× 10 =

{20}/√3

cm
Hence, area of equilateral triangle =

√3/4×({20}/√3)^2

√3/4 × {400}/3

{100}/√3 cm^2

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