Kalo bisa dua dua nya ya kak

38. Volume bangun gabungan = volume persegi panjang + volume limas segitiga
Volume persegi panjang =
[tex]p \times l \times t \\ = 25 \times 8 \times 10 \\ = 2000 \: {cm}^{3} [/tex]
Volume limas segitiga =
[tex] \frac{1}{2} \times p \times l \times t \\ = \frac{1}{2} \times 25 \times 8 \times 15 \\ = 25 \times 4 \times 15 \\ = 100 \times 15 \\ = 1500 \: {cm}^{3} [/tex]
Volume bangun gabungan
[tex]volume \: persegi \: panjang + volume \: limas \: segitiga \\ = 2000 {cm}^{3} + 1500 {cm}^{3} \\ = 3500 {cm}^{3} [/tex]
39. Volume air = 3/4 × volume kolam
Volume kolam =
[tex]p \times l \times t \\ = 240 \times 160 \times 30 \\ = 1152000 \: {cm}^{3} [/tex]
Volume air
[tex] \frac{3}{4} \times volume \: kolam \\ = \frac{3}{4} \times 1152000 \\ = 3 \times 288000 \\ = 864000 \: {cm}^{3} [/tex]