SOLUTION: Ref. Questions 1048321, 1048398: (x + 21)^2 = x^2 + 42x + 441 = x^2 + 1869 x^2 - x^2 + 42x + 441 - 441 = x^2 + 1869 - 441 42x = 1428 x = 34 (side of upper base)

Algebra ->  Surface-area -> SOLUTION: Ref. Questions 1048321, 1048398: (x + 21)^2 = x^2 + 42x + 441 = x^2 + 1869 x^2 - x^2 + 42x + 441 - 441 = x^2 + 1869 - 441 42x = 1428 x = 34 (side of upper base)       Log On


   

Question 1048486: Ref. Questions 1048321, 1048398:
(x + 21)^2 = x^2 + 42x + 441 = x^2 + 1869
x^2 - x^2 + 42x + 441 - 441 = x^2 + 1869 - 441
42x = 1428

x = 34 (side of upper base)
34 + 21 = 55 (side of lower base)
34 * 34 = 1156 (area of upper)
55 * 55 = 3025 (area of lower)
3025 - 1156 = 1859
??

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
IDK what you're talking about.