ExpertEasy1 markShort Answer
AQA GCSE · Question 06.1 · Geometry and Measures
AB is a straight line. Work out the size of angle x.
AB is a straight line. Work out the size of angle x.
How to approach this question
1. Recognise that angles on a straight line add up to 180°.
2. The two angles shown are 145° and x.
3. Set up the equation: 145 + x = 180.
4. Solve for x by subtracting 145 from 180.
Full Answer
35°
The angles on a straight line sum to 180°.
In the diagram, the angle 145° and the angle x are on the straight line AB.
Therefore, their sum must be 180°.
145° + x = 180°
To find x, subtract 145° from 180°:
x = 180° - 145°
x = 35°
Common mistakes
✗ Assuming the angles add up to 90° or 360°.
✗ Making a calculation error in the subtraction.
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