Question 28

What is the area (in sq cm) of an equilateral triangle of side 14 cm?

Solution

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Side of equilateral triangle = $$a=14$$ cm

=> Area of equilateral triangle = $$\frac{\sqrt3}{4}a^2$$

= $$\frac{\sqrt3}{4}\times(14)^2$$

= $$\frac{196}{4}\sqrt3=49\sqrt3$$ $$cm^2$$

=> Ans - (A)

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