Mathematics
Classify the angles whose magnitudes are given below:
(i) 56°
(ii) 125°
(iii) 90°
(iv) 180°
(v) 215°
(vi) 328°
(vii) 89°
(viii) 178°
Lines & Angles
1 Like
Answer
(i) 56° lies between 0° and 90°.
∴ 56° is an acute angle.
(ii) 125° lies between 90° and 180°.
∴ 125° is an obtuse angle.
(iii) 90° is exactly a right angle.
∴ 90° is a right angle.
(iv) 180° is exactly a straight angle.
∴ 180° is a straight angle.
(v) 215° lies between 180° and 360°.
∴ 215° is a reflex angle.
(vi) 328° lies between 180° and 360°.
∴ 328° is a reflex angle.
(vii) 89° lies between 0° and 90°.
∴ 89° is an acute angle.
(viii) 178° lies between 90° and 180°.
∴ 178° is an obtuse angle.
Answered By
2 Likes
Related Questions
What fraction of a revolution have you turned through if you stand facing
(i) north and turn clockwise to face west?
(ii) south and turn anti-clockwise to face east?
(iii) east and turn clockwise (or anti-clockwise) to face west?
Also find the number of right angles turned in each case.
Match the following:
(i) Straight angle (a) More than half a revolution (ii) Right angle (b) Less than one-fourth of a revolution (iii) Complete angle (c) Half of a revolution (iv) Acute angle (d) One-fourth of a revolution (v) Obtuse angle (e) Between 1⁄4 and 1⁄2 of a revolution (vi) Reflex angle (f) One complete revolution State which of the following angles with a small letter in the following diagrams are acute, which are obtuse and which are reflex:
Use your protractor to measure each of the angles marked in the following figures:
