The ratio of the angles ∠A and ∠B of a non-square

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The ratio of the angles ∠A and ∠B of a non-square rhombus ABCD is 4 : 5, then the value of ∠C is :

1. 50°
2. 45°
3. 80°
4. 95°

Correct Option: C

Given , The ratio of the angles ∠A and ∠B of a non-square rhombus ABCD = 4 : 5
Let 4y and 5y are angles .
⇒ 4y + 5y = 180°
⇒ 9y = 180°
⇒ y = 20°
∴ ∠C = 4y = 80°