Diameter is 7. please help

Step-by-step explanation:

Half 7 which is 3.5 the square it which turns to 12.25 then multiply it by pi which is equal to 3.14 making it 38.465 or if u use 3 as pi it is 36.75 just use whatever answer is the closest because pi goes on along time so its not always accurate

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,