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AC = √(144 + 81)
= √225
= 15 cm
DA² = DC² - AC²
= √(625 - 225)
= √400
= 20 cm
=12²+9²
=144+81
=225
AC=√225 = 15 cm
AD²=CD²-AC²
=25²-15²
=625-225
=400
AD=√400
AD=20 cm