Answer:
9
Step-by-step explanation:
Setup a proportion
= 
Cross multiply
40n = 360
Divide by 40
40n/40 = 360/40
n = 9
The half angle formula is:
sin x/2 = +/- √ (( 1-cos x ) / 2 )
5π/12 = 5π/6 : 2
sin 5π/12 = +/- √(( 1 - cos ( 5π/6)) / 2 )
cos 5π/6 = cos 150° = -√3/2
≈ 0.966 ( this is sin 5π/12 )
Answer:
the answer would be-
Step-by-step explanation:
The polygon whose vertices in the coordinate plane are (3,3) (5,0) (5,-3) (1,-3) (1,0) is a triangle on top of a rectangle which is neither equilateral nor equiangular nor regular.
i.e. none of the above.