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……………. angles are two angles whose measure add to $90 °$ . (complementary / supplementary)

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Solution

Complementary angles :
Two angles are called complementary when their measures add to $90 °$ .
In the given figure the sum of $∠ B O D$ and $∠ D O A$ is $90 °$ (i.e. $60 ° + 30 ° = 90 °$ )
So, $∠ B O D$ and $∠ D O A$ are complementary angles.
Hence complementary angles are two angles whose measure add to $90 °$ .

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(i) If two angles are complementary, then the sum of their measures is _______.

(ii) If two angles are supplementary, then the sum of their measures is _______.

(iii) Two angles forming a linear pair are _______.

(iv) If two adjacent angles are supplementary, they form a _______.

(v) If two lines intersect at a point, then the vertically opposite angles are always _______.

(vi) If two lines intersect at a point, and if one pair of vertically opposite angles are acute angles, then the other pair of vertically opposite angles are _______.

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Supplementary angles are two angles whose measures add to …………….. ( $90 ° / 180 °$ ).

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If two adjacent angles are ……………. they form a linear pair. (complementary / supplementary)

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Two acute angles ………… be complementary angles. (can / cannot)

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If an angle is equal to $10 °$ , then its supplementary angle is an ………….. angle. (acute / obtuse).

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Choose the correct word and fill in the blanks :……………. angles are two angles whose measure add to 90°. (complementary / supplementary)

Complementary angles :Two angles are called complementary when their measures add to 90°.In the given figure the sum of ∠BOD and ∠DOAis 90° (i.e. 60°+30°=90°)So, ∠BOD and ∠DOA are complementary angles.Hence complementary angles are two angles whose measure add to 90°.

Choose the correct word and fill in the blanks :
……………. angles are two angles whose measure add to $90 °$ . (complementary / supplementary)