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

$(i).\ 65^{\circ},\ 115^{\circ}$

$(ii).\ 63^{\circ},\ 27^{\circ}$

$(iii).\ 112^{\circ},\ 68^{\circ}$

$(iv).\ 130^{\circ},\ 50^{\circ}$

$(v).\ 45^{\circ},\ 45^{\circ}$

$(vi).\ 80^{\circ},\ 10^{\circ}$

**To do:**

We have to identify which of the given pairs of angles are complementary and which are supplementary.

**Solution:**

**Complementary angles:**

Two angles are said to be complementary if the sum of their measures is $90^o$.

Supplementary angles:

Two angles are said to be supplementary if the sum of their measures is $180^o$.

Therefore,

(i) $65^{\circ}+115^{\circ}=180^{\circ}$

They are supplementary angles.

(ii) $63^{\circ}+27^{\circ}=90^{\circ}$

They are complementary angles.

(iii) $112^{\circ}+68^{\circ}=180^{\circ}$

They are supplementary angles.

(iv) $130^{\circ}+50^{\circ}=180^{\circ}$

They are supplementary angles.

(v) $45^{\circ}+45^{\circ}=90^{\circ}$

They are complementary angles.

(vi) $80^{\circ}+10^{\circ}=90^{\circ}$

They are complementary angles.

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