Luas bangun disamping adalah...

sisi segitiga yang lain = √(8² + 15²)
= √(64 + 225)
= √289
= 17

17 - 11 = 2x
6 = 2x
3 = x

3² + t² = 5²
9 + t² = 25
t² = 16
t = 4

luas segitiga = ½ × a × t
= ½ × 8 × 15
= 4 × 15
= 60 cm²

luas trapesium = (a + b)/2 × t
= (11 + 17)/2 × 4
= 28/2 × 4
= 14 × 4
= 56 cm²

luas bangun = 60 + 56 = 116 cm²