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2
ac=12²+ 5²=144+25=√169=13
cd=12²x16²=√400=20
kll=13cm+13cm+20cm+20cm=66cm
BC = 24
BO=BC=12
AB = AC = √(5²+12²)
= √(25+144)
= √(169)
= 13
AD = 21
DO = 21-5
= 16
BD = CD = √(12²+16²)
= √(144+256)
= √(400)
= 20
K = 13+13+20+20
= 66
L = 1/2.D1.D2
= 1/2(21)(24)
= 252