In a A ABC, AD is the bisector of ∠A, meeting side BC at D. If AC = 4.2 cm, DC = 6 cm, BC =10 cm, find AB.

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asked Jan 9, 2018 in Class X Maths by aditya23 (-854 points)
In a A ABC, AD is the bisector of ∠A, meeting side BC at D. If AC = 4.2 cm, DC = 6 cm, BC =10 cm, find AB.

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1 Answer

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answered Jan 9, 2018 by priya12 (-11,407 points)

Given: In a ABC, AD is the bisector of
∠A. meeting side BC at D.AC = 4.2cm,
DC= 6 cm and BC=10 cm
To find: AB.
In  ABC,
AB/AC = BD/DC [By internal bisector theorem]   
AB = 4 x 4.2/6 = 2.8 cm
∴ AB = 2.8 cm

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