Topics
Geometry
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India
Class XI

Radian Measure of Angles

Lesson
Practice

Interactive practice questions

Answer the following.

a

Convert $360^\circ$360° to radians.

b

Convert $180^\circ$180° to radians.

Easy
1min

How can you convert between radian and degree angle measures?

Easy
1min

Convert $90^\circ$90° to radians.

Give your answer in exact form.

Easy
< 1min

Convert $225^\circ$225° to radians.

Give your answer in exact form.

Easy
1min
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Outcomes

11.SF.TF.1

Positive and negative angles. Measuring angles in radians and in degrees and conversion from one measure to another. Definition of trigonometric functions with the help of unit circle. Truth of the identity sin^2 x + cos^2 x = 1, for all x. Signs of trigonometric functions and sketch of their graphs. Expressing sin (x + y) and cos (x + y) in terms of sin x, sin y, cos x and cos y. Deducing the identities like following: cot(x + or - y), sin x + sin y, cos x + cos y, sin x - sin y, cos x - cos y (see syllabus document)

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