5*6=30
and 6*5=30
basically we have to take Lcm of 5 and 6=30
30th day they both will be together
We'll use the following properties of sine and cosine to prove this:



Then it's just a matter of filling it in...
sin20sin40 * sin60sin80 = 1/2(cos20 - cos60) * 1/2 (cos20 - cos140) =
1/8( cos40 + 1 - cos160 - cos120 - cos40 - cos80 + cos80 + cos200) =
1/8(1 - cos160 - cos120 + cos200) =
1/8(1 - cos160 - cos120 + cos160) =
1/8(1 - cos120 ) = 1/8( 1 + 1/2 ) = 3/16
Answer:
78.53975
Find area of circle using radius, divide that by four
So "of" means multiply and 30% is .3 so multiply .3 by the 240 times and u get... 72!