TOLONG DONG NOMOR 4,6,7,8,9,10,11 BANTU SALAH SATU JG GPP PLZ

[tex]6. \:rumus \: luas = \pi \times r \times r + \pi \times r \times s \\ r = \frac{d}{2} = \frac{18}{2} = 9 \\ cari \: s \: dulu(pake \: pytagoras) \\ s = \sqrt[2]{ {9}^{2} + {12}^{2} } = \sqrt[2]{81 + 144} = \sqrt[2]{225} = 15 \\ luas = 3.14 \times 9 \times 9 + 3.14 \times 9 \times 15 \\ = 254.34 + 423.9 = 678.24 {cm}^{3} [/tex]
[tex]7. \: luas \: dua \: bidang = luas \: tabung \: tanpa \: tutup + luas \: kerucut \\ luas = (\pi \times r \times r + 2\pi \times r \times t) + (\pi \times r \times r + \pi \times r \times s) \\cari \: tinggi \: kerucut = 14 - 10 = 4cm \\ cari \: s \: nya \: dulu \\ s = \sqrt[2]{ {3}^{2} + {4}^{2} } = \sqrt[2]{9 + 16} = \sqrt[2]{25} = 5 \\ luas = (3.14 \times 3 \times 3 + 3.14 \times 3 \times 10) + (3.14 \times 3 \times 3 + 3.14 \times 3 \times 5) \\ = 28.26 + 188.4 + 28.26 + 471 \\ = 292.02 \: {cm}^{3} [/tex]
[tex]8. \: 40 \: orang \: siswa \: rata - rata \: 160 \: cm \\ 18 \: orang \: laki - laki \: 162.75 \: cm \\ 22 \: orang \: perempuan = ... \\ rata \: rata \: perempuan = 40 \times rata \: rata \: siswa - 18 \times rata \: rata \: laki \: laki \\ = 40 \times 160 - 18 \times 162.75 \\ = 6400 - 2929.5 = 3470.5[/tex]
[tex]9. \: median = \frac{75 + 80}{2} = \frac{155}{2} = 77.5[/tex]
[tex]10. \: rata - rata = \frac{(60 \times 1) + (65 \times 2) + (70 \times 2) + (75 \times 3) + (80 \times 5) + (85 \times 5) + (90 \times 7)}{25} = \frac{2010}{25} = 80.4 \\ yang \: tidak \: lulus \: 13 \: orang[/tex]
[tex]11.360 - (80 + 75 + 95 + 60) = 360 - 310 = 50 \\ \frac{50}{360} \times 540 = 75 \: orang[/tex]
maaf kalo salah, semoga membantu