radians Flashcards
1
Q
What is one radian?
A
The angle subtended at the centre of a circle by an arc whose length is equal to the radius of the circle.
2
Q
what is 2pi rad in degrees?
A
360 degrees
3
Q
what is pi rad in degrees?
A
180 degrees
4
Q
what is 1 rad in degrees
A
180/pi degrees
5
Q
How do you convert from degrees to radians?
A
*pi/180
6
Q
How do you convert from radians to degrees?
A
*180/pi
7
Q
What is the equation for arc length?
A
arc length=radius * theta
8
Q
What is the equation for the area of a sector of a circle?
A
Area = 0.5 * radius^2 * theta
9
Q
What is the equation for the area of a segment of a circle?
A
Area = 0.5 * radius^2 * (theta - sin(theta))
