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  1. Angles of a quadrilateral are in the ratio 3 : 4 : 5 : 8. The smallest angle is
    1. 54°
    2. 40°
    3. 36°
    4. 18°
Correct Option: A

Let First angle = 3k
Second angle = 4k
Third angle = 5k and
Fourth angle = 8k

We know 3k + 4k + 5k + 8k = 360°
⇒ 20k = 360°
∴ k = 18 °

Measure of smallest angle = 3k
=3 x 18 °
= 54 °


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