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3. Identify which of the following pairs of angles are complementary and which are supplementary.

           (i) 65^{o},115^{o}        (ii) 63^{o}, 27^{o}     (iii) 112^{o}, 68^{o}

          (iv) 130^{o}, 50^{o}      (v) 45^{o}, 45^{o}      (vi) 80^{o}, 10^{o}
 

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We know that the sum of supplementary angles is  180^{\circ} and the sum of complementary angle is 90^{\circ}.

(i) Sum of the angles is :    65^{\circ}\ +\ 115^{\circ}\ =\ 180^{\circ}. Hence these are supplementary angles.

(ii) Sum of the angles is :    63^{\circ}\ +\ 27^{\circ}\ =\ 90^{\circ}. Hence these are complementary angles.

(iii) Sum of the angles is :    112^{\circ}\ +\ 68^{\circ}\ =\ 180^{\circ}. Hence these are supplementary angles.

(iv) Sum of the angles is :    130^{\circ}\ +\ 50^{\circ}\ =\ 180^{\circ}. Hence these are supplementary angles.

(v) Sum of the angles is :    45^{\circ}\ +\ 45^{\circ}\ =\ 90^{\circ}. Hence these are complementary angles.

(vi)  Sum of the angles is :    80^{\circ}\ +\ 10^{\circ}\ =\ 90^{\circ}. Hence these are complementary angles.

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Devendra Khairwa

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