Primary 5 Angles
Keywords
- Straight angle
- A half turn measuring 180°.
- Full turn
- One complete turn around a point measuring 360°.
- Vertically opposite angles
- The opposite pair made when two straight lines cross.
Angles on a straight line
Angles next to each other on a straight line add up to 180°.
Find the missing angle
The green angle is 125°. What is x?
Straight line = 180°
Step 0 of 2
Try together
Two angles on a straight line are 68° and y. Find y.
Reveal the answer
y = 180° − 68° = 112°.
Angles at a point
Angles all the way around a point add up to 360°.
Find the missing angle
Two angles are 110° and 130°. What is x?
Around a point = 360°
Step 0 of 2
Try together
Angles of 90°, 145° and z meet around a point. Find z.
Reveal the answer
z = 360° − 90° − 145° = 125°.
Vertically opposite angles
When two straight lines cross, opposite angles are equal.
Find the missing angle
The top angle is 70°. What is x?
Opposite angles are equal
Step 0 of 2
Try together
Two lines cross. One angle is 48°. Find the angle directly opposite it.
Reveal the answer
48°. Vertically opposite angles are equal.