Trig- Section 1.1
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16 Terms
radius to degree formula
π radians/ 180
degree to radians formula
180/ π radians
area of a sector formula
A= 1/2r²theta
arc length formula
S=rtheta
when solving for area of a sector, theta must be in
radians
how do you find coterminal angles
add 360 or subtract 360
what formula do you use when finding the central angle and are have theta
s= theta x radius
what formula do you use when finding the central angle and are given the arc length
theta= s/r
you must always convert theta degree to radians when
finding arc length
soh
sin= opposite/hypotenuse
cah
cos= adjacent/hypotenuse
toa
tangent= opposite/adjacent
what is the reciprocal of sin
csc
what is the reciprocal of cos
sec
what is the reciprocal of tangent
cotangent