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252 = 1/2 x 24 x mk
252 = 12 x mk
mk = 21
mo = √(nm²-no²)
= √(20²-12²)
= √(400-144)
= √256
= 16
ko = mk-mo
= 21-16
= 5
nk = kl = √(ko²+no²)
= √(5²+12²)
= √(25+144)
= √169
= 13
K = 2(nk+nm)
= 2(13+20)
= 2(33)
= 66 cm