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3.14 x 5^ 2 = 78.5
maka.. perbandingannya = 19.625 : 78.5
1:4
1/4 π D1² : 1/4 π D2² ------> 1/4, π di coret aja
D1² : D2²
5² : 10²
25 : 100
1 : 4