plisss jawab, pakek cara

alas segitiga = 26cm - 10cm ÷ 2cm
          = 8cm
luas trapesium = (a+b) × t ÷2=
                   270= (10+26)×t ÷2
                   270= 36×t ÷2
                   15 = t
15 kuadrat + 8 kuadrat = √×
         225    + 64   = √289
                             = 17
keliling =10+17+26+17
            =64 cm