AC9M4M04 • Test
Estimating and Comparing Angles
Read the quick preparation notes, then start when you are ready.
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Quick preparation
- Compare the indicated opening or turn with a right angle. Acute is smaller than a right angle; obtuse is larger than a right angle and smaller than a straight angle.
- A straight angle is two right angles. A reflex angle is greater than a straight angle and less than a full revolution. One revolution is four right angles.
- Arm length and page orientation do not change angle size. Align a checked right-angle template at the vertex and along one arm; follow the marked arc to identify the intended angle.
SkillrHub Test guide
Each attempt draws five questions from the full bank. Repeat an attempt to meet more questions and use the feedback to improve.
- Worked example: On a top-view sketch of an open door, place a right-angle template at the drawn hinge, with one edge along the closed position. If the marked opening is wider than the template but less than a half turn, it is obtuse. Check the indicated opening, because the same arms also enclose a different angle around the other side.
- Common mistake: Longer arms do not make a larger angle. A spirit level checks level or plumb using the appropriate vial; use a set square or a checked right-angle template to compare a corner with a right angle.
- Materials and practical tasks: Prepare a pencil, separate paper, folding paper or card, a checked right-angle template and the tools named in a practical task. Arrange set-square or spirit-level work with an adult or in class. Complete the actual task before asking an adult to check it.
- Review: Point to the vertex and marked opening, compare it with right-angle turns, and explain how a template or suitable tool supports your conclusion.
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