This activity is about calculating the unknown angle on a straight line.
The angles at a point on a straight line add up to 180°.
180° is half a complete revolution.
Notice that 35° + 145° = 180°
e.g. Find the missing angle in degrees.
The missing angle is 180° - 65° = 115°
Want to understand this further and learn how this links to other topics in maths?
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