Lesson Example Discussion Quiz: Class Homework |
Example |
Title: Angles(Interior & Exterior) |
Grade: 4-a Lesson: S2-L2 |
Explanation: The best way to understand geometry is by looking at some examples. Take turns and read each example for easy understanding. |
Examples:
Observe the following figure to see the interior and exterior angles.
Step 1a
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In this image, ∠1 & ∠2 and ∠7 & ∠8 are exterior angles, while ∠3 & ∠4 and ∠5 & ∠6 are interior angles. |
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Explanation: in this image, we can identify the exterior angles as ∠1 & ∠2 and ∠7 & ∠8, while the interior angles are ∠3 & ∠4 and ∠5 & ∠6. |
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Step 1b
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∠4 and ∠5 are alternate interior angles, while ∠1 & ∠8 and ∠2 & ∠7 are the pairs of alternate exterior angles. ∠3 and ∠6 are also alternate interior angles.∠4 & ∠5 , ∠3 and ∠6 are alternate interior angles, while ∠1 & ∠8 and ∠2 & ∠7 are the pairs of alternate exterior angles. |
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Explanation: ∠4 & ∠5 are alternate interior angles, as are ∠3 & ∠6. ∠1 & ∠8 and ∠2 & ∠7 are the alternate exterior angles. |
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Step 1c
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∠3 and ∠7 are corresponding angles while ∠4 and ∠8 are also corresponding angles due to the parallel lines AB and CD. |
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Explanation: ∠3 & ∠7, and ∠4 & ∠8 are corresponding angles due to parallel lines AB & CD. |
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