Math Problem Statement

In a triangle ABC there is a line BD inside it at AC If angle ACB is theta then prove that angle ADB is 90-theta

Solution

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Math Problem Analysis

Mathematical Concepts

Geometry
Triangles
Angle Properties
Exterior Angle Theorem

Formulas

Sum of angles in a triangle: α + β + θ = 180°
Exterior angle theorem: ∠ADB = α + β

Theorems

Exterior Angle Theorem
Sum of Angles in a Triangle

Suitable Grade Level

Grades 9-12