Lines and Angles

- An angle is made when two lines or line segments meet. For example:

- When the sum of the measures of two angles is 90°, the angles are called
**complementary angles**.

Here, ∠AOB and ∠PQR are complementary as (∠AOB + ∠PQR) = 75° + 15° = 90°.

- When the sum of the measures of two angles is 180°, the angles are called
**supplementary angles**.

Here, ∠ABC and ∠PQR are supplementary as (∠ABC + ∠PQR) = 110° + 70° = 180°.

- A pair of angles are…

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