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4) lp = 4×22/7 × r²
616 = 4 × 22/7 × r²
r² = 616 : (4×22/7)
r = √49 = 7 cm
5) lp = 1/4 × 4 × 22/7 × 7 × 7
= 22/7 × 7 × 7 = 154 cm³