Q. 14.8( 13 Votes )
Define the following terms:
(i) Angle
(ii) Interior of an angle
(iii) Obtuse angle
(iv) Reflex angle
(v) Complementary angles
(vi) Supplementary angles
Answer :
(i) Angle – A shape formed by two lines or rays diverging from a common vertex.
Types of angle: (a) Acute angle (less than 90°)
(b) Right angle (exactly 90°)
(c) Obtuse angle (between 90° and 180°)
(d) Straight angle (exactly 180°)
(e) Reflex angle (between 180° and 360°)
(f) Full angle (exactly 360°)
(ii) Interior of an angle – The area between the rays that make up an angle and extending away from the vertex to infinity.
The interior angles of a triangle always add up to 180°.
(iii) Obtuse angle – It is an angle that measures between 90 to 180 degrees.
(iv) Reflex angle – It is an angle that measures between 180 to 360 degrees.
(v) Complementary angles – Two angles are called complementary angles if the sum of two angles is 90°.
(vi) Supplementary angles – Angles are said to be supplementary if the sum of two angles is 180°.
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