Question
An equilateral triangle has an altitude of 21√3 cm.
Calculate the radius of its incircle.Solution
ATQ,
Altitude = (√3a/2)
(√3a/2) = 21√3
a = 42 cm
Inradius = a / (2√3) = 42 / (2√3) = 21 / √3 = 7√3 cm
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