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G1.2 • Sec 1 MOE
Geometry & Measurement
Angles & Parallel Lines
Use angle properties with parallel lines and a transversal.
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Learning objectives
- • Identify corresponding, alternate, and interior angles
- • Calculate unknown angles
- • Apply properties of angles on a straight line
Learning methods:CRAI-We-YouSpaced reviewRetrievalMetacognition
Brain warm-up (try before we teach)
Try first, then learn step by step
Two angles on a straight line are 110° and x°. Find .
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Foundation — I Do → We Do → You Do
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Step 1 of 4I Do — Learn
Angle facts
- Angles on a straight line sum to 180°
- Vertically opposite angles are equal
- Corresponding angles (parallel lines) are equal
- Alternate angles (parallel lines) are equal
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Step 2 of 4I Do — Learn
Worked example
Two parallel lines are cut by a transversal. One corresponding angle is 65°.
The corresponding angle on the other parallel line is also 65°.
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Step 3 of 4We Do — Guided
Guided: Straight line
Two angles on a straight line are 110° and x°. Find .
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Step 4 of 4You Do — Practice
Practice: Alternate angles
Alternate angles are equal. If one alternate angle is 48°, find the other.