8. misal perbandingan AC : BD = 4x : 3x maka 4x.3x/2 = 150 12x²/2 = 150 6x² = 150 x² = 25 x = 5 panjang diagonal AC = 4x = 4.5 = 20 cm BD = 3x = 3.5 = 15 cm
9. panjang OP = √13² - 12² = 5 cm panjang diagonal PQ = 5.2 = 10 cm panjang diagonal AC = 12.2 = 24 cm panjang diagonal BD = 16 cm maka luas daerah yang diarsir = 24.16/2 - 24.10/2 = 192 - 120 = 72 cm²
luas belah ketupat = 16.30/2 = 480/2 = 240 cm²
7. 15(3x + 2)/2 = 150
45x + 30 = 300
45x = 270
x = 6
d2 = 3x + 2
substitusikan
d2 = 3.6 + 2 = 20 cm
8. misal perbandingan AC : BD = 4x : 3x
maka
4x.3x/2 = 150
12x²/2 = 150
6x² = 150
x² = 25
x = 5
panjang diagonal AC = 4x = 4.5 = 20 cm
BD = 3x = 3.5 = 15 cm
9. panjang OP = √13² - 12² = 5 cm
panjang diagonal PQ = 5.2 = 10 cm
panjang diagonal AC = 12.2 = 24 cm
panjang diagonal BD = 16 cm
maka luas daerah yang diarsir
= 24.16/2 - 24.10/2 = 192 - 120 = 72 cm²