Question

If side BC of ∆ABC is produced to D such that <ACD = 120° and <B = 1/2<A, then find <A.​

Answer 1

Answer:

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Answer 2

Answer:

Solution:

∵ Sum of three angles of a triangle is 180°

∴ In ∆ABC, ∠A = 55°, ∠B = 40°

But ∠A + ∠B + ∠C = 180° (Sum of angles of a triangle)

RD Sharma Class 9 Chapter 11 Coordinate Geometry

⇒ 55° + 40° + ∠C = 180°

⇒ 95° + ∠C = 180°

∴ ∠C= 180° -95° = 85°

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