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In a ΔABC, AD is the bisector of ∠A. If AB = 6.4 cm, AC = 8 cm and BD = 5.6 cm, find DC.

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Question

In a ΔABC, AD is the bisector of ∠A. If AB = 6.4 cm, AC = 8 cm and BD = 5.6 cm, find DC. 

 

Sum
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Solution

It is give that AD bisects ∠A.
Applying angle – bisector theorem in Δ ABC, we get:
`(BD)/(DC)=(AB)/(AC)`
⟹`(5.6)/(DC)=6.4/8`
⟹DC `=(8xx5.6)/6.4=7cm`

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Chapter 7: Triangles - EXERCISE 7A [Page 372]

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R.S. Aggarwal Mathematics [English] Class 10
Chapter 7 Triangles
EXERCISE 7A | Q 4. (i) | Page 372
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