CPhill

x = 1

rcosΘ = 1

r = 1/cosΘ

r = secΘ

If we subtract x from both sides, we have

Well....that's better than I did.....I got frustrated and gave up after 15 min.......LOL!!!!

We have .....

cos(35)  = 200 / d     where d is the distance from the window to the bottom of the tower

Rearranging, we have

d = 200/cos(35)   = about 244.15 ft

......................................

I don't understand what you mean when you say you have the "sector of the circle."

The sector area is given by pi * r^2 * (n / 360]  where r is the radius and n is the measure (in degrees) of the central angle of the sector [the angle between the two radial lines of the sector]

The arc length is given by r [ n/180] *pi    ....and r and n are as above

$80 x 1.15  = $92

31₈ =   3(8)^1 + 1(8)^0 =  24 + 1 = 25₁₀

I assume you mean "five numbers"

There are 12 numbers and we wish to choose any 5 of them....so....

C(12,5)   = 792 possible five number combinations