You would find the radius by halving the diameter. Then you use the equation

and you get about 28.2 meters.
Hi! So to solve for these, all you have to do is keep PEDMAS in mind. For example, for 2x^3 (Just a fancy way of writing "to the third power") first plug in 3: 2(3)^3 and take it to the third power because E (exponent) comes before M (multiplication) in PEDMAS. You should get 2(27) which then equals 54. Hope this helps:)
Answer:
tan(20) = 4 / x
tan(20)x = 4
x = 4 / tan(20)
<u>x = 10.99 units</u>
Step-by-step explanation: