kalau jawab jangan ngasal kasih juga caranya
Jawaban:
7. Lp bola = 4×phi×r²
[tex] \frac{22}{7} \times 14 \times 14 \times 4 \\ = 22 \times 2 \times 56 \\ = 2464 { \: cm}^{2} [/tex]
8. Luas selimut kerucut = phi×r×s
Luas selimut kerucut + Lp bola
[tex]( \frac{1}{2} \times 4 \times \frac{22}{7} \times 7 \times 7) + ( \frac{22}{7} \times 7 \times 25)[/tex]
[tex] = (2 \times 22 \times 7) + (22 \times 25) \\ = 154 + 550 = 704 { \: cm}^{2} [/tex]
9. V limas = luas alas×tinggi×⅓
[tex]64 \times 3 \times \frac{1}{3} \\ = 64 { \: cm}^{3} [/tex]
10. Lp tabung = 2×phi×r×(r+t)
[tex]2 \times \frac{22}{7} \times 7 \times (7 + 11) \\ = 44 \times 18 = 792 { \: cm}^{2} [/tex]
