Adjacent Interior Angle of Triangle

Properties	Types / Classification	Perimeter of Equilateral Triangle	Median of Triangle	Interior of a Triangle
Exterior of a Triangle	Altitude of a Triangle	Interior Angles of Triangle	Exterior Angles of Triangle	Interior Opposite Angles of Triangle
Adjacent Interior Angle of Triangle	Congruent Triangles	Area of Triangle	Area of Triangle by Heron's Formula	Construction of Triangle (compass)

Before you study this topic, you are advised to read: Interior Angles of a Triangle Exterior Angles of a Triangle In the following diagram you can see exterior angles and interior angles. Adjacent Interior Angles are shown with diagram in following: In the below diagram you can see that ∠ 2 is an exterior angle. So, ∠ 3 is Adjacent Interior Angle to ∠ 2 In the below diagram you can see that ∠ 6 is an exterior angle. So, ∠ 5 is Adjacent Interior Angle to ∠ 6 In the below diagram you can see that ∠ 1 is an exterior angle. So, ∠ 1 is Adjacent Interior Angle to ∠ 4 Study More Solved Questions / Examples What can you say about the sum of an exterior angle of a triangle and its adjacent angle ? Find measure of ∠ CBD in the following figure: Find the measure of adjacent interior angle of a triangle, whose exterior angles is 80°