Tolong bantuin jawab ka pake caranya ya

28. jarak A ke D = √(280-200)²+150² = √6.400 + 22.500 = √28.900 = 170 km

29. BD = √9²+12² = √81+144 = √225 = 15 cm
Luas = 15x5 = 75 cm²

30. panjang kerangka = 5 x (50+70) = 600 cm = 6 meter.
biaya = 6 x 12.000 = Rp. 72.000,-