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=12 cm x 16 cm : 2
= 96 cm²
b. kell segitiga = 12 cm + 17,08 cm + 17,08 cm
= 46,176 cm
2. L segitiga = a.t :2
216 = alas . 18 cm :2
216 = alas x 9 cm
216 :9 cm = alas
24 cm = alas segitiga
2,4 dm = alas segitiga
b.Keliling = a + b + c = 12 + (√12² +16²) + (√12² + 16²)
= 12 + (√144 + 256) + (√144 + 256)
= 12 + √400 + √400 = 12 + 20 + 20 = 52 cm
2.)Alas = L2 / t = 216 x 2 / 18 = 432 / 18 = 24 cm
Ok,itu jawabanya.....^_~