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15 June, 22:32

Two angles of a quadrilateral measure 210° and 40°. The other two angles are in a ratio of 2:9. What are the measures of those two angles?

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  1. 15 June, 23:42
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    Angles in the ratio 2:9 are 20° and 90° respectively.

    Step-by-step explanation:

    Step 1: Find the 2 angles in the quadrilateral in the ratio 2:9. Let the angles be 2x and 9x.

    Sum of the angles of a quadrilateral = 360°

    ⇒ 2x + 9x + 210° + 40° = 360°

    ⇒ 11x + 250° = 360°

    ⇒ 11x = 360 - 250 = 110°

    ⇒ x = 110/11 = 10

    ∴ Angles are 2x = 20° and 9x = 90°
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