Fundamentals of trigonometry

180 degrees is equal to how many radians?

• 1 2 pi
• 2 1
• 3 pi / 2
• 4 pi

sin(90 degrees) equals:

• 1 0
• 2 -1
• 3 1
• 4 1/2

The length of an arc of radius 5 cm subtending an angle of 2 radians is:

• 1 10 cm
• 2 2.5 cm
• 3 25 cm
• 4 7 cm

tan x is equal to:

• 1 sin x / cos x
• 2 cos x / sin x
• 3 sin x cos x
• 4 1 / sin x

sin(2x) is equal to:

• 1 sin2 x
• 2 cos2 x - sin2 x
• 3 2 sin x cos x
• 4 2 sin x