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2x = 180-50
2x = 130
x = 130/2
x = 65
2b. 2x+x+90 = 180
3x = 180-90
3x = 90
x = 90/3
x = 30
2c. pelurus x = 180 - 85 - 35 = 180 - 120 = 60
sudut x = 180 - 60 = 120
3. Tiga garis dapat dibuat segitiga jika jumlah 2 garis terpendek lebih panjang dari garis terpanjang
a. 3+6 .....8
9 > 8 (dapat dibuat segitiga)
b. 5+8 .... 14
13 < 14 (tidak bisa dibuat segitiga)
4a. K = 6+8+10 = 24 cm
L = 6x8/2 = 24 cm²
b. K = 2(14+11) = 2x25 = 50 cm
L = 14x9 = 126 cm²
c. K = 15+15+9+4 = 43 cm
L = (4+9) x 12/2 = 78 cm²
d. K = 4x 20 = 80 cm
L = 24x32/2 = 384 cm²
5. Luas lantai = 6 m x 6 m = 600 cm x 600 cm = 360.000 cm²
Luas ubin = 30 cm x 30 cm = 900 cm²
Jumlah ubin = 360.000 / 900 = 400 ubin
6. K = 2 (90+65) = 2x155 = 310 m
Biaya = 310 m x Rp 135.000 / m = Rp 41.850.000