Math Problem Statement

त्रिभुज ABC की भुजा BC को D तक बढ़ा दिया जाता है उसमे यदि कोण ACD=112, कोण ABC= 3/4 कोण BAC तो कोण ABC= ?

A. 80 B.40 C 60 D 20

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Solution

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Math Problem Analysis

Mathematical Concepts

Triangle
Exterior Angles
Angle Ratio

Formulas

Exterior angle theorem: exterior angle = sum of the opposite interior angles
Angle ratio relation: angle ABC = (3/4) angle BAC

Theorems

Exterior Angle Theorem

Suitable Grade Level

Grades 9-10