Find the length of he altitude of an equilateral triangle of side `3sqrt (3)` cm
Area of the triangle = `sqrt(3)/4 xx (3sqrt(3))^2` = `(27sqrt(3))/(4)` let the height be h.
Then , `1/2 xx 3sqrt(3) xx h = (27sqrt (3))/(4)`
`hArr h = (27sqrt (3))/(4 )xx (2)/(3sqrt (3))` = ` 9/2 ` = 4.5 cm
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