How to find the radius of a sector given arc length and theta

What is the formula used to calculate the arc length in this lesson?

• S = R + Theta

• S = Theta - R

• S = R / Theta

• S = R * Theta

Why is it necessary to convert Theta from degrees to radians in this problem?

• Radians are the standard unit for all calculations.

• Radians are easier to calculate with.

• The formula requires Theta to be in radians.

• Degrees are not a valid unit for this formula.

What is the simplified form of 100π / 180?

• 100π / 180

• 10π / 18

• 5π / 9

• 50π / 90

How do you solve for R when it is multiplied by a fraction?

• Multiply by the reciprocal of the fraction.

• Subtract the fraction.

• Divide by the fraction.

• Add the reciprocal of the fraction.

What is the approximate value of the radius R when evaluated with π?

• 4.0 cm

• 5.0 cm

• 6.0 cm

• 3.0 cm