April 21, 2014

Homework Help: Pre-Calculus

Posted by Shreya on Tuesday, November 6, 2012 at 8:14pm.

Trigonometric Functions, Radian Measure

∏ <-- will be using this for pi

Using exact values, convert to radians ( hint use fraction of ∏)

90 = 90*∏/180 = 1∏/2

^^would it be right to also call it 2∏ radians?

Determine the angle at the centre of the circle, radius 6cm, for each arc length.Express each angle in radians and then in degrees.

a = rθ
3 = 6θ
1/2 = θ


^One of my friends got a totally different answer, and she got
θ = 2 rad
2*180/∏ = 114.59

^Ive no idea how she got that :S

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