Question

abc is a right angled triangle B=90 if ABD is an exterior angle ofabc. find its measure​

Answer 1

Step-by-step explanation:

ang. ABD = 90⁰

In ∆ABC,

A + B + C = 180⁰ (Angle Sum Property)

A + 90⁰ + C = 180⁰

A + C = 90⁰

ang.ABD = A + C (Exterior angle is the sum of opposite two interior angles)

ang.ABD = 90⁰