Two co-interior (allied) angles lie between parallel lines. One is . What is the other?
Answer and explanation
Correct answer: C. 68°
- Step 1: Co-interior angles add up to .
- Step 2: .
Answer
68°.
Why not the others: 112°: Equal angles would be alternate or corresponding angles, not co-interior ones. 78°: This subtracts from , which is not the angle sum for co-interior angles. 248°: This subtracts from , which is the total of angles around a point.
Practise more Geometry and Measures.
Free questions with an explanation for every one, and full timed GCSE English and Maths Resits (Grade 4) mock tests.
More Geometry and Measures questions
- What is the size of one interior angle of a regular octagon?
- What is the total surface area of a cuboid measuring cm by cm by cm?
- The bearing of town from town is . What is the bearing of from ?
- An isosceles triangle has two sides of cm and a base of cm. What is its area?
- A ladder m long leans against a vertical wall. Its foot is m from the wall. How high up the wall does it reach?
- The point is translated by the vector . What are the coordinates of its image?