# trig

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"Two points A and B on the circle x^2 + y^2 = 49 form a central angle of 30 degree with the radii draw to them. Find the length of the arc AB in term of pi?"

• trig -

x^2 + y^2 = 49
r^2 = 49
r = 7

Arc length A = angle in rads * r

To convert 30 deg to radians
30 deg * pi/180 = 30pi/180 = pi/6

A = pi/6 * 7
A = 7pi/6

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