Math Formulas to Know for exam

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.