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BD = √25² - 15²
= √625 - 225
= √400 = 20 cm
ED = √20² - 16²
= √400 - 256
= √144 = 12 cm
= 12 cm + 14 cm
= 26 cm
L1 + L2
½ x (a+b) x t + ½ x a x t
½ x (14+26) x 16 + ½ x 15 x 20
½ x 40 x 16 + 15 x 10
320 + 150
470 cm²