Sectors and arcs (radians)

Question 1

Arc length

Answer 1

Arc length=r θ

Question 2

Area of a sector

Answer 2

0.5 r^2 θ=área of a sector

Question 3

Small angle approximations

Answer 3

Sin(θ) ≈ θ
tan(θ) ≈ θ
Cos(θ) ≈ 1-(θ^2/2)

Question 4

Conert degrees into radians

Answer 4

(x/180) x pie

Question 5

Convert radians into degrees

Answer 5

(pie/180) x x

Question 6

Volume of a sphere

Answer 6

4/3(pie) r^3