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= πr² × t
88.704 = 22/7 × r² × 36
22/7 × r² = 88.704 ÷ 36
22/7 × r² = 2464
r² = 2464 ÷ 22/7
= 2464 × 7/22
r² = 112 × 7
= 784
r = √784 = 28 cm
b. Luas selimut tabung = 2πr t
= 2 × 22/7 × 28 × 36
= 6636 cm²