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IrishMath Ch 13 Trig

Chapter 13 Trig Flashcards

QuestionAnswer
sin x opp/hyp
cos x adj/hyp
tan x opp/adj
hypotenuse longest side of right triangle
adjacent leg leg that touches angle (helps form the angle)
opposite leg leg that is across from angle and doesn't help form angle
sec x hyp/adj
csc x hyp/opp
cot x adj/opp
0 degrees = ____ radians 0 degrees = 0 radians
180 degrees = _____ radians 180 degrees = Pi radians
90 degrees = _____ radians 90 degrees = Pi/2 radians
270 degrees = _____ radians 270 degrees = 3Pi/2 radians
To convert from degrees to radians, multiply by: Pi radians / 180 degrees
To convert from radians to degrees, multiply by: 180 degrees / Pi radians
Arc Length of Sector of Circle S = r theta (theta is in radians)
Area of Sector of Circle A = 1/2 r^2 theta (theta is in radians)
On the x-y coordinate plane: sin A = y/r
On the x-y coordinate plane: cos A = x/r
On the x-y coordinate plane: tan A = y/x
Created by: JenJo21
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