B = 2p 8B + 4p = 28.000 16p + 4p = 28.000 20p= 28.000 p = 1400 B = 2800 B + p = 4200
Luas juring = 288/360 x 3,14 x 100 = 251,2 cm^2 Luas selimut kerucut = 3,14 x 10 x r 251,2 = 31,4 x r r = 8 cm (jari2 kerucut) tinggi kerucut = akar dari (10^2 - 8^2) = 6 Volume = 1/3 x 22/7 x 100 x 6 = 628,57 cm^2
Verified answer
12-y = 6+y 6 = 2y y = 34x+6 = 6x-2 8 = 4x x = 2
x+y = 5
B = 2p 8B + 4p = 28.000 16p + 4p = 28.000 20p= 28.000 p = 1400
B = 2800
B + p = 4200
Luas juring = 288/360 x 3,14 x 100 = 251,2 cm^2
Luas selimut kerucut = 3,14 x 10 x r
251,2 = 31,4 x r
r = 8 cm (jari2 kerucut)
tinggi kerucut = akar dari (10^2 - 8^2) = 6
Volume = 1/3 x 22/7 x 100 x 6 = 628,57 cm^2
rata-rata =(20x5+25x4+30x9+35x4+40x7+45x3+ 50x1)/(5+4+9+4+7+3+1)
= 1075/33 = 32,58
Jumlah siswa > rata-rata ada 15 orang
Jumlah siswa < rata-rata ada 17