| Corresponding angles are equal and pairs of them are shown in the diagram below. |
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| angle b = angle d (corresponding angles)
angle a = angle c (corresponding angles)
These are above the parallel lines and there are two more below, unlabelled. They form an F shape. |
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Interior Angles
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| These are on the inside of the parallel lines as shown below. |
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| Interior angles add up to 180o . |
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| Again these properties can be used to solve problems. |
For example: In the diagram below, calculate angles a, b, c and d. |
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