The measures of two angles of a triangle are
given. Find the measure of the third angle.
(i) 90°, 40°

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Solution

Concept Used: ANGLE SUM PROPERTY OF TRIANGLE.
Prerequisite: Sum of all interior angles is 180.
1. The sum of the three angles of a triangle = 180
So, third angle = 180 -( 90 +40)
= 180 -130 = 50°
The measure of the third angle is 50°
Final Answer: 50⁰

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