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1° equals

pi/180 radians

1 radian equals

180/pi degrees

radian measure times radius

arc length

90°

Radians is pi/2

60°

Radians is pi/3

45°

Radians is pi/4

30°

Radians is pi/6

trigonometry

triangle measurement including the length of the sides and the angles in a triangle

180 degrees

the sum of the angles of triangle

hypotenuse

the side opposite the right angle

parabolas format

y=(x-h)^2+k

x intercept

the point where the line crosses the x-axis

domain

is the set of all x values in the function

sin

Opposite / Hypotenuse

cos

Adjacent / Hypotenuse

tan

Opposite / Adjacent

the classic 30° triangle

has a hypotenuse of length 2, an opposite side of length 1 and an adjacent side of √(3):

The classic 45° triangle

has two sides of 1 and a hypotenuse of √(2):

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