Jawabanmu

2014-06-03T14:33:21+07:00
2. D
4. D
7. √9²+12² = √81+144 = √225 = 15
15×18÷2= 135
luas permukaan= (135×4) + 18² = 540+324 = 864(D)
8. luas alas = 144
rusuk alas=√144 = 12
3x=12
x=4
tinggi limas = 2x = 2×4 = 8
√8²+6²=√100 = 10
luas segitiga = 10×12÷2= 60
luas permukaan = (60×4)+144
240+144 = 384(b)