Arc Length Formula and Sector Area Formula Explained!

What is the formula for the circumference of a circle with radius 'r'?

• C = πr²

• C = 2πr

• C = πd

• C = r²

What is the formula for the area of a circle with radius 'r'?

• A = 2πr

• A = πr

• A = πr²

• A = 2r

A circle has a central angle of 120 degrees and a diameter of 24 cm. What is the length of the arc intercepted by this angle?

• 6π cm

• 8π cm

• 12π cm

• 24π cm

A circle has a radius of 5 cm. A sector of this circle has a central angle of 63 degrees. What is the area of this sector?

• (35/8)π cm²

• (63/5)π cm²

• (25/63)π cm²

• (5/360)π cm²