The sizes of angles a, b and c of the diagram not drawn to scale are 50°, 100°, and 30° respectively.
The angles a, b and c are angles in a triangle.
Therefore, the sum of a , b and c should be equals to 180 degrees.
Angle a
let's find angle a using the rule as follow:
- sum of angle at a point is 360 degrees
Therefore,
a = 360 - 310 = 50°
Angle b
let's find angle b using the rule as follow:
- Angle on a straight line is equals to 180 degrees.
Therefore,
b = 180 - 80 = 100°
Angle c
let's find angle c using the rule as follow:
- Sum of angle in a triangle is 180 degrees
Therefore,
c = 180 - 50 - 100 = 30°
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