# Find the Area of an Equilateral Triangle Having Altitude H Cm. - Mathematics

Short Note

Find the area of an equilateral triangle having altitude h cm.

#### Solution

Altitude of a equilateral triangle, having side is given by

Altitude = sqrt(3)/2 a

Substituting the given value of altitude cm, we get

h = sqrt(3)/2 a

a = 2/sqrt( 3) h cm

Area of a equilateral triangle, say A having each side a cm is given by

A= sqrt(3)/4 a^2

Area of the given equilateral triangle having each equal side equal to 2/sqrt(3) h cm  is given by;

A = sqrt(3)/4 ( 2/sqrt(3) h  cm )^2

A = sqrt(3)/4 xx 4/3 h^2

A = h^2/sqrt(3)cm ^2

Concept: Application of Heron’s Formula in Finding Areas of Quadrilaterals
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#### APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 17 Heron’s Formula
Exercise 17.3 | Q 7 | Page 24

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