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yang ditanyakan adalah tinggi...?
caranya :
s=L/r = 84/3,5 = 24 cm
L² = s(s-a) (s-b) (s-c) => (mencari alas)
84² = 24 (24-10) (24-17) (24-c)
7056 = 24 x 14 x 7 x (24-c)
7056 = 2353 x (24-c)
24-c = 7055/2353
24-c= 3
-c = 3-24
-c= -21
c= 21
L = 1/2 x alas x tinggi
84 = 1/2 x 21 x tinggi
tinggi = 84/21 x 2
tinggi = 8 cm
jadi jawabannya , c.8 cm