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22/7 x r^2 = 1,54
r^2 = 1,54 x 7/22
= 0,49
r = 0,7 dm
diameter = 2 x r
= 2 x 0,7
= 1,4 dm
1,54dm² = πr²
154cm² = × r²
154cm²×7 = 22r²
1078cm² = 22r²
r² =
r² = 49cm²
r = √49cm²
r = 7cm
karena jari jarinya 7cm , maka diameternya adalah
diameter = 2×r
diameter = 2×7cm
diameter = 14cm
cm di jadikan ke dm
diameter = 14cm
diameter =
diameter = 1,4dm
jadi diameternya adalah 1,4dm