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In δDef, If ∠E = 90°, Then Find the Value of ∠D + ∠F. - Geometry

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Sum

In ΔDEF, if ∠E = 90°, then find the value of ∠D + ∠F. 

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Solution

In ΔDEF

Sum of all angle of Triangle = 180°

∠D + ∠E + ∠F = 180°

∠D + 90° + ∠F = 180°

∠D + ∠F  = 180° - 90°

∠D + ∠F  = 90°

Concept: Property of 30°- 60°- 90° Triangle Theorem
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