Q2 of 45 Page 94

Classify each one of the following angles as right, straight, acute, obtuse or reflex:


(a) It is an acute angle as its measure is less than 90°


(b) It is an obtuse angle because its measure is more than 90° but less than 180°


(c) Right angle as its measure is 90°


(d) Reflex angle as its measure is more than 180° but less 360°


(e) Straight angle as its measure is 180°


(f) Acute angle as its measure is less than 90°.


More from this chapter

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7

Where will the hour hand of a clock stop, if it starts

(a) from 6 and turns through 1 right angle?


(b) from 8 and turns through 2 right angles?


(c) from 10 and turns through 3 right angles?


(d) from 7 and turns through 2 straight angles?

 1

Match the following:































Column A



Column B



(i) Straight angle



(a) Less than one-fourth Of a revolution



(ii) Right angle



(b) More than half a Revolution



(iii) Acute angle



(c) Half of a revolution



(iv) Obtuse angle



(d) One-fourth of a Revolution



(v) Reflex angle



(e) Between and of a Revolution




(f) One complete Revolution


 1

What is the measure of

(i) a right angle?


(ii) a straight angle?

 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∠A = 53° and m∠B = 35°, then m∠A > m∠B.