We started with a word problem trying to find arc length based on latitude and longitude.

Reviewed the equations for the circumference of a circle and the area of a circle.

You can get arc length by multiplying the angle (in radians) by the radians. Thinking of the equation for circumference can help for that since it’s the angle of an entire circle in radians multiplied by the radius. Or you can multiply the fraction of the entire circle by the circumference.

Looked at a few more complicated graphing problems of trig functions.

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