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Q.

Each side of an equilateral triangle measures 10cm, then the area of the triangle is

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a

43.4 {cm}^{2}

b

43.2 {cm}^{2}

c

43.1 {cm}^{2}

d

43.3 {cm}^{2}

answer is C.

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Detailed Solution

side of an equilateral triangle

=

10cm

area of equilateral triangle $=$ $\frac{\sqrt{3}}{4} a^{2} = \frac{\sqrt{3}}{4} \times {(10)}^{2}$

$= \frac{\sqrt{3}}{4} \times 10 \times 10 = 25 \sqrt{3} = 43.3 {cm}^{2}$

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