Studied by 30 people
length of an arc
angle/360 (pie*r2)
Distance Formula
d=√(x2 - x1)2 + (y2 - y1)2.
Midpoint Formula
m=(x1+x2)/2, (y1+y2)/2.
Trig Ratios
SOHCAHTOA
Geometric Mean
√a*b.
Pythagorean Theorem
a^2 + b^2 = c^2.
Arc/Angle Rules
center angle is the same, on the circle angle is half, outside angle is the saverage, inside angle is the average.
Point Slope Form and Slope Formula
Point Slope Form: y-y1 = m(x-x1)
Slope Formula: y = mx + b
Law of Sines Ratio
sin∠a/a = sin∠b/b = sin∠c/c.
