Khan Academy

Two-variable inequalities from their graphs (K-A)

Parallel & perpendicular lines from graph (K-A)

Parallel & perpendicular lines intro (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)

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

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

Proof: perpendicular lines have negative reciprocal slope (K-A)

Coordinate plane word problem (K-A)

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

Writing equations of perpendicular lines (K-A)

Distance between point & line (K-A)

Dividing line segments (K-A)

Dividing line segments: graphical (K-A)

Midpoint formula (K-A)

Challenge problems: Inscribed angles (K-A)

Challenge problems: Inscribed shapes (K-A)

Geometric constructions: circle-inscribed equilateral triangle (K-A)

Geometric constructions: circle-inscribed regular hexagon (K-A)

Geometric constructions: circle-inscribed square (K-A)

Inscribed angle theorem -video (K-A)

Inscribed angle theorem proof (K-A)

Inscribed angles (K-A)