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The three interior angles of any triangle add up to 180°. If we know two, we can find the third.

 

Examples

a + 29° + 122° = 180°
a = 180°  - 151 = 29°
b + 48° + 90° = 180°
or b + 48° = 90°
b = 42°


c = 60° (isosceles triangle)
d + 2×60° = 180°
d = 60°

Triangle is equilateral
f + 94° = 180° (angles on the straight line)
f = 86°
86° + 35° + e = 180°
e = 59°

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