Central Angles
A circle has a central angle of 36 degrees. What is its inscribed angle?
18 degrees.
What is the formula for the circumference?
2πr
What is the formula for the area of a circle?
πr^2
What is the formula for the area of a circle's sector?
πr^2×(θ/360)
What is the formula for the length of a circle's arc?
2πr^2×(θ/360)