MEDIUM
9th Manipur Board
IMPORTANT
Earn 100

ABC is a triangle. The bisector of the exterior angle at B and the bisector of ∠C intersect each other at D. Prove ∠BDC=12∠A.

Important Questions on Lines and Angles

MEDIUM
9th Manipur Board
IMPORTANT
Mathematics for Class 9>Chapter 6 - Lines and Angles>EXERCISE 6.4>Q 8
In a ∆ABC, AD bisects ∠A and ∠C>∠B. Prove that ∠ADB>∠ADC.
MEDIUM
9th Manipur Board
IMPORTANT
Mathematics for Class 9>Chapter 6 - Lines and Angles>EXERCISE 6.4>Q 9
The side BC of a ∆ABC is produces to D to form the exterior angle  ∠ACD. The bisector of ∠BAC at BC at E. Prove that ∠ABC+∠ACD=2∠AEC.
MEDIUM
9th Manipur Board
IMPORTANT
Mathematics for Class 9>Chapter 6 - Lines and Angles>EXERCISE 6.4>Q 10
ABC is an isosceles triangle in which AB=AC and AE bisects the exterior angle CAD at A. Prove that AE∥BC.