You are standing at point b. point b is 21 feet from the center of the circular water storage tank and 20 feet from point a. \frac{ }{ab} a b is tangent to \odot ⊙ o at a. find the radius of the tank.

r = 6.40 feet

Step-by-step explanation:

Given line AB is tangent to circle O at point A, this means ∡OAB = 90°

Hence this is a right angle triangle and we can use the Pythagorean theorem.

r² + 20² = 21²

r²  = 21² - 20²

r²  = 441 - 400

r²  = 41

r  = √41 = 6.40 feet

you answer is a

step-by-step explanation:

0 is its x and y coordinate