Question

For given figure, find the value of unknown.​

Answer 1

Answer:

b =30°

1 = 90°

2= 120°

3 = 150°

Answer 2

Answer:

b = 30°

Step-by-step explanation:

There are 3 angles in the figure and those are 5b°, 4b°, 3b°.

Concept used:

Sum of all angles around a point is 360°

Solution:

5b + 4b + 3b = 360°

→ 12b = 360°

→ b = 360 ÷ 12

→ b = 30°

For finding out the angles:

5b° = 5 (30°) = 150°

4b° = 4 (30°) = 120°

3b° = 3 (30°) = 90°

Verification:

Sum of all the angles should be equal to 360°.

150° + 120° + 90°

= 360°

★ HENCE PROVED ★