Q2 of 158 Page 159

Triangle DEF of Fig. 6.6 is a right triangle with ∠E = 90°.


What type of angles are ∠D and ∠F?

Given: Δ DEF is a right triangle with ∠E = 90°


Formula Used/Theory:-


Sum of all angles of triangle is 180°


In Δ DEF


∠D + ∠E + ∠F = 180°


∠D + 90° + ∠F = 180°


∠D + ∠F = 180° - 90°


∠D + ∠F = 90°


∴ Angle D and F are complimentary angles


As their sum is 90°

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