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(i) a right angle?

(ii) a straight angle

Answer :

(i) a right angle = 90°

(ii) a straight angle = 180°

- Q.2 Say True or False: (a) The measure of an acute angle < 90° (b) The measure of an obtuse angle < 90° (c) The measure of a reflex angle > 180° (d) The measure of one complete revolution = 360° (e) If m \(\angle \) A = 53° and m \(\angle \) B = 35°, then m \(\angle \) A > m \(\angle \)B.
- Q.3 Write down the measures of (a) some acute angles (b) some obtuse angles (give at least two examples of each)
- Q.4 Measures the angles given below using the protractor and write down the measure.
- Q.5 Which angle has a large measure? First estimate and then measure. Measure of Angle A = Measure of Angle B =
- Q.6 From these two angles which has larger measure? Estimate and then confirm by measuring them.
- Q.7 Fill in the blanks with acute, obtuse, right or straight: (a) An angle whose measure is less than that of a right angle is _____ (b) An angle whose measure is greater than that of a right angle is ____ (c) An angle whose measure is the sum of the measures of two right angles is _______ (d) When the sum of the measures of two angles is that of a right angle, then each one of them is _____ (e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be ______
- Q.8 Find the measure of the angle shown in each figure. (First estimate with your eyes and then find the actual measure with a protractor).
- Q.9 Find the angle measure between the hands of the clock in each figure:
- Q.10 In the given figure, the angle measure 30°. Look at the same figure through a magnifying glass. Does the angle becomes larger? Does the size of the angle change?
- Q.11 Measure and classify each angle:

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