Cordinate Geometery

Standard Form

(X-h)² + (Y-k)² = R²

General Form

X²+Y²+Ax+By+C=0

Area

$\pi r$²

Circumference

2$\pi$r

Slope

Y2-Y1/$\frac{y2-y1}{x2-x1}=slope$

Find distance length of segment

$$\sqrt{\left(x2-x1\right)^2+\left(y2-y1\right)^2}$$

Midpoint

$$\frac{X2+X1}{2},\frac{Y2+Y1}{2}$$

Tangent

A line that intersects circle at exactly 1 point