Angle facts
The facts
- Angles on a straight line add up to 180°.
- Angles round a point add up to 360°.
- Vertically opposite angles (where two straight lines cross) are equal.
- Angles in a triangle add up to 180°. An isosceles triangle has two equal base angles.
Here x = 180 − 50 − 60 = 70°.
Angles with x
If the angles on a line are 3x and (2x + 30)°, then 3x + 2x + 30 = 180, so 5x = 150 and x = 30.
Check: 90 + 90 = 180.
Loading the question
This question is in Brainlag Plus