Penjelasan dengan langkah-langkah:
a. (1/4 2πr) + 20 + 20
= (1/4 2×3.14×20) + 40
= 31.4 + 40
= 71.4 cm
b. (1/2πD) + (28+28)
= (1/2×22/7×28) + 56
= 100 cm
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Penjelasan dengan langkah-langkah:
a. (1/4 2πr) + 20 + 20
= (1/4 2×3.14×20) + 40
= 31.4 + 40
= 71.4 cm
b. (1/2πD) + (28+28)
= (1/2×22/7×28) + 56
= 100 cm