Alternate, Corresponding & Allied Angles

This lesson covers:

  1. Alternate angles are the same 
  2. Corresponding angles are the same
  3. Allied (or co-interior) angles add up to 180°
Diagram showing allied co-interior angles formed by a transversal intersecting two parallel lines.

Which type of angles are shown above?

Alternate

Corresponding

Allied

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What do allied co-interior angles add up to?

180

°

°

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2

Which type of angles are shown in the diagram below?

Diagram showing alternate angles formed by a transversal intersecting two parallel lines.

Alternate angles 

Corresponding angles

Allied angles 

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1

What is the size of the angle marked x?

Diagram showing alternate angles with one angle marked as 50 degrees and the other angle marked as x.
50

°

°

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Give a reason for your answer

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2

What is the size of the angle marked x?

125

°

°

Diagram showing alternate, corresponding and allied angles with a marked angle x and a given angle of 55 degrees.

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Give a reason for your answer.

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What is the size of the angle marked x?

128

°

°

Diagram showing alternate, corresponding, and allied angles with angle x and 128 degrees.

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Give a reason for your answer.

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2

What is the size of the angle marked x?

70

°

°

Diagram showing alternate, corresponding, and allied angles with angles x and y marked.

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What is the size of the angle marked y?

70

°

°

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2