Question

In trapezium the ratio of ∠A : ∠B : ∠C : ∠D is 1 : 2 : 4 : 5, then find the smaller angle?
1. 30^° 
2. 60^° 
3. 45^° 
4. 90^° 

Answer 1

Correct Answer - Option 1 : 30^° 

Given:

∠A : ∠B : ∠C : ∠D = 1 : 2 : 4 : 5

Concept used:

In any quadrilateral sum of all angles is 360^° 

Calculation:

12 unit = 360^° 

⇒ 1 unit = 30^° 

∴ smaller angle ∠A = 30^°