halo ka tolong bantuannya ya, ini itu udah ada jawabannya tapi kita nentuin jawabannya benar apa salah, tapi di suruh pake cara. mohon bantuannya ya ka..
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Jawaban:
[tex]9. \: volume \: limas = \frac{1}{3} \times la \times t \\ sisi \: limas = \frac{48}{4} = 12 \: cm \\ \frac{1}{3} \times (12 \times 12) \times 9 \\ = \frac{1}{3} \times 144 \times 9 \\ = 432 \: {cm}^{3} \: (benar)[/tex]
[tex]10. \: volume \: balok = plt \\ 15 \times 10 \times 8 \\ = 1.200 \: {cm}^{3} \\ volume \: limas = \frac{1}{3} \times la \times t \\ t = 20 - 8 = 12 \: cm \\ \frac{1}{3} \times (15 \times 10) \times 12 \\ = \frac{1}{3} \times 150 \times 12 \\ = 600 \: {cm}^{3} \\ volume \: gabungan = \\ 1.200 + 600 \\ = 1.800 \: {cm}^{3} \: (benar)[/tex]
[tex]11. \: luas \: permukaan = luas \: alas + \\ luas \: tutup + luas \: selimut \\ luas \: alas \: dan \: tutup = \\ 2 \times \frac{1}{2} \times a \times t \\ 2 \times \frac{1}{2} \times 24 \times 10 \\ = 240 \: {cm}^{2} \\ luas \: selimut = \\ (a + t + c) \times t \: prisma \\ c = \sqrt{ {24}^{2} + {10}^{2} } \\ c = \sqrt{576 + 100} \\ c = \sqrt{676} = 26 \: cm \\ (24 + 10 + 26) \times 30 \\ = 60 \times 30 \\ = 1.800 \: {cm}^{2} \\ luas \: permukaan = \\ 240 + 1.800 \\ = 2.040 \: {cm}^{2} (salah)[/tex]
[tex]12. \: volume \: bola = \frac{4}{3} \pi { {r}^{3} } \\ r = \frac{22}{2} = 11 \: cm \\ \frac{4}{3} \times 3.14 \times {11}^{3} \\ = \frac{4}{3} \times 3.14 \times 1331 \\ = 5572.453... \: (benar)[/tex]