Probably the five senses.
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5! - sqrt (5*5)
(55 + 5 + 5 ) / 5
Assuming the sides of the triangle a=5, b=5 and c=6, the semiperimeter s=(5+5+6)/2=8. Height d=3 is not necessary if you use Heron´s formula for the area (A): A = [s(s-a)(s-b)(s-c)]1/2 = [8(8-5)(8-5)(8-6)]1/2 = [144]1/2 = 12
5 acts in a Shakespearean play
Since r varies directly with s, we have r = ks (replace k with 5 and s with 7) r = (5)(7) r = 35