Pre calc unit 3 Find the missing radius given arc length and an angle in degrees

The video tutorial explains how to solve a geometry problem involving converting an angle from degrees to radians and using the formula s = rθ to find the radius. The teacher emphasizes the importance of converting degrees to radians and provides step-by-step guidance on solving the equation. The tutorial concludes with advice on leaving answers in terms of π unless otherwise specified.

What is the first step when given an angle in degrees for a problem involving radians?

• Ignore the angle

• Convert the angle to radians

• Multiply the angle by 2

• Use the angle directly in the formula

How do you convert 100 degrees to radians?

• Multiply by π/90

• Multiply by 90/π

• Multiply by π/180

• Multiply by 180/π

What is the equivalent of 100 degrees in radians?

• π/5

• 5π/9

• π/2

• 2π/9

What is the formula used to find the radius when given arc length and angle in radians?

• R = s * θ

• R = θ/s

• R = s/θ

• R = s + θ

When should you leave your answer in terms of π?

• Never, always convert to decimal

• Always, unless asked for a decimal approximation

• Only when the angle is in degrees

• Only when the radius is less than 10