This week I was nervous because everyone was telling me that we were starting Trig. and saying that it is really hard. The week started off pretty hard and I did not really understand anything too good but it started getting easier. One thing that I really know, and I'm pretty pumped about knowing, is the Trig Chart.
0° sin0=0 cos0=1 tan0=0 csc0=undefined sec0=1 cot0=undefined
30° sinπ/6=1/2 cosπ/6=√3/2 tanπ/6=√3/3 cscπ/6=2 secπ/6=2√3/3 cotπ/6=√3
45° sinπ/4=√2/2 cosπ/4=√2/2 tanπ/4=1 cscπ/4=√2/2 secπ/4=√2/2 cotπ/4=1
60° sinπ/3=√3/2 cosπ/3=1/2 tanπ/3=√3 cscπ/3=2√3/3 secπ/3=2 cotπ/3=√3/3
90° sinπ/2=1 cosπ/2=0 tanπ/2=undefined cscπ/2=1 secπ/2=undefined cotπ/2=0
(I swear I did that all by myself off the top of my head =])
One thing that I am struggling in, however, is Sector of a Circle.
I think the thing that is messing me up is how the letters stand for completely different things, like K is the are of a sector.
Sector of a Circle:
ReplyDelete1. s = rθ
2. k = θ/2 r^2
(**Note: r = radius, θ = angle, s= arc length, & k = area of sector)
Example:
A sector of a circle has a radius 6cm and central angle 0.5 radians. Find its arc length and area.
k = 1/2r^2θ
k = 1/2(6)^2(0.5)
k = 9
S = rθ
s = (6)(0.5)
s = 3
see easy all you got to do is the formulas and what each letter stands for...