I know a=pi*r^2 anyways, the triangle is:4*8/2=16 The semicircle is: 4pi because 4 is diameter, /2 then square u still get 4. 4*3.14 = 12.56 12.56 + 16 = 28.56.
Its kind of like how it is on a car to tell how fast your going i hoped this helped!
The length of the lighthouse (120) and the length of the shadow (160) form the sides of a triangle.
Use the formula a^2 + b^2 = c^2
120^2 + 160^2 = c^2
Assuming you are referring to simple interest not compound that that it is annual you would gain $100 putting you at $600