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Measurement and Types of Angles

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  • (0:29) Different Types of Angles (Names & Degrees): Angles are classified by size — acute angle ($<$ 90°), right angle (90°), obtuse angle (90° $<$ θ $<$ 180°), straight angle (180°), reflex angle (180° $<$ θ $<$ 360°), and full angle (360°).
  • (1:20) Measuring Angles with a Protractor: Align the protractor’s centre with the vertex and the zero line with one arm. Read where the other arm crosses the scale.
  • (2:35) Constructing Angles Over 180°: For 210°, draw the smaller internal angle (150°), as 150° = 360° − 210°. The external angle is 210°.

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Measurement and Types of Angles

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Q: What is the measure of a straight angle?

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Q: Which of these is an acute angle?

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Q: What is the sum of the angles in a full circle?

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Q: Construct a 210° angle using a protractor. What smaller angle should you first draw?

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Q: An angle measures 110°. What type of angle is it?

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Q: Two angles form a straight line. One angle is 5 times the size of the other angle. What is the measure of the larger angle?

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