Chapter 5 - Radians Flashcards
1
Q
What is 2π in degrees?
A
360 degrees
2
Q
What is π/6 in degrees?
A
30 degrees
3
Q
What is 90 degrees in radians?
A
π/2
4
Q
How do you find the arc length (l) of a circle, radius r and angle θ?
A
l = rθ
5
Q
Area of a sector of a circle with radius r and angle θ (in radians)
A
A = 1/2r2θ
6
Q
Area of a segment in a circle of radius r and angle θ (in radians)
A
A = 1/2r2(θ - sinθ)
7
Q
For small angles what is sinθ equal to?
A
θ
8
Q
For small angles what is cos θ equal to?
A
1 - θ2/2
9
Q
For small angles what is tan θ equal to?
A
θ
10
Q
A
