Kak tolong jawab, sama caranya ya kak, besok dikumpul
Jawaban:
1. d = 21
r = 21/2 = 10.5
volume udara bola = 4/3 x 3,14 x 10,5³
= 4/3 x 3634,9425
= 4846,59 cm³
2. L. permukaan = 616
616 = 4 x 3,14 x r²
616 = 12,56 r²
616/12,56 = r²
49,044856 = r²
√49, 044856 = r
7,00318399 = r
3. volume = 8624
8624 = 4/3 x 22/7 x r²
8624 = 88/21 r²
8624 x 21 = 88 r²
181104/88 = r²
2058 = r²
√2058 = r
45,356 = r
4. d = 20
r = 10
l. permukaan = 4 x 3,14 x 10²
= 1256 cm²
5. d = 6
r = 3
volume = 4/3 x 3,14 x 3 x 3
= 4/3 x 28,26
= 113,04/3 = 37,68 cm³
l. permukaan = 4 x 3,14 x 3²
= 113,04 cm²
