Surface area of a sphere with a diameter of 17.5 inches

Me. i can't figure out this question. give an explanation too. .

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte

If f (x) = 2x2 +5/(x-2), complete the following statement: f(6) =