Khan Academy

Tangents of circles problem (example 2) (K-A)

Tangents of circles problem (example 3) (K-A)

Area of a sector (K-A)

Features of a circle from its standard equation (K-A)

Graphing a circle from its standard equation (K-A)

Writing standard equation of a circle (K-A)

Distance between point & line (K-A)

Distance formula (K-A)

Midpoint formula (K-A)

Dividing line segments: graphical (K-A)

Dividing line segments (K-A)

Parallel lines from equation (example 2) (K-A)

Parallel lines from equation (example 3) (K-A)

Parallel lines from equation (K-A)

Perpendicular lines from equation (K-A)

Parallel & perpendicular lines from graph (K-A)

Proof: parallel lines have the same slope (K-A)

Parallel & perpendicular lines intro (K-A)

Proof: perpendicular lines have opposite reciprocal slopes (K-A)

Writing equations of perpendicular lines (example 2) (K-A)

Writing equations of perpendicular lines (K-A)

Area of trapezoid on the coordinate plan (K-A)

Challenge problem: Points on two circles (K-A)

Classifying quadrilaterals on the coordinate plane (K-A)

Coordinate plane word problem (K-A)