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=> π r² = 1,54 dm²
= 22/7 X r² = 1,54 dm²
r² = 1,54 = 0,49
22/7
r = √0,49 = 0,7 dm²
Diameter = 2 X r
= 2 X 0,7 = 1,4 dm²
Semoga bermanfaat ^_^