tolong jawab nomor 1

a. Lp bola = πd²
= 3,14 × 100×100
=31400 cm²
b. Lp kerucut = πr(r+s)
=3,14×9(9×12)
=3,14×9(21)
=593,46 cm²
c. Lp tabung = 2πr(r+t)
= 2×3,14×0,75(0,75+6)
=4,71(6,75)
=31,7925 cm²

Maaf kalo salah