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6 = 210 / s
s= 35
s= (a + b + c)/ 2
35 = (45 + c)/2
70 = 45 + c
c = 25
Maka, panjang CD adalah
L = (alas x t) /2
210 = (25 x CD)/2
CD = (210 x 2)/ 25
CD = 16,8