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= 20 cm - 11 cm
= 9 cm
c = 15 cm
b = 9 cm
a² + b² = c²
a² = c² - b²
a² = 15² - 9²
a² = 225 - 81
a² = 144
√a² = √144
a = 12
DP = 12 cm
L = a × t
= AB × DP
= 20 cm × 12 cm
= 240 cm²