Khan Academy Inscribed Angles

Mathisfun Circle Theorems

# Calculation #1

# Calculations #2

Construction Ideas from mathisfun

# Construction: Parallel Lines

Use the tools provided in the tool bar to draw one or more circles between the parallel lines, such that the parallel lines are tangent to the circles. Make your circles tangent to adjacent circles too!

# Construction: Oblique Lines

Use the tools provided in the tool bar to draw a circle between the lines such that both lines are tangent to the circle.

Euclid’s Elements: How did Euclid say it?