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Arc Length
(mArc AB / 360) × 2πr
Area of a Circle
πr²
Circumference of a Circle
2πr
Sector Area
(mArc AB / 360) × πr²
Area of a Segment
(mArc AB / 360) × πr² -1/2bh
Area of an Annulus
πr² - πr
Area of a Regular Polygon
½ a × ns
Special Right T relationship:
30-60-90: base is x, hyp is 2x, long side is x square root of 3
45-45-90: base is x, hyp is x square root of 2