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bd=√625-225
bd=√400
bd=20
L∆=½at
L∆=½×15×20
L∆=150cm²
20²-16² = 400-256 = 144
√144 = 12
ed=14+12=26
L trapesium= ½(a+b)t
Lt= ½(14+26)16
Lt= 40×8 = 320 cm²
LABCDE= 320+150=470cm²