Question

9. In ∆ABC, ∠= 80°, CD bisect ∠ and CD ⊥ AB. Find the measure of ∠. Please tell fast and get brainlest ans

Answer 1

Step-by-step explanation:

In △ABC,∠BAD+∠ADB+∠DBA=180°

by angle sum property of a triangle.

50° +90°+∠DBA=180°

⇒∠DBA=180° −140°

=40°

∴∠B=40°

Answer 2

Correct answer:-

In △ABC,∠BAD+∠ADB+∠DBA=180° by angle sum property of a triangle.

50° +90° +∠DBA=180°

⇒∠DBA=180° −140° =40°

∴ ∠B = 40° [Ans].

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