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perimeter = 42cm
sides = 18, 10 and we don't know the 3rd side
let the 3rd side be x.
=> 10 + 18 + x = 42
=> x = 14cm
herons formula = √s*(s-a)(s-b)(s-c)
= √21 * (21-18)(21-10)(21-14)
= √21 * 3 * 11 * 7
= √7*3*3*11*7 (because 21 = 7*3)
= 7 * 3√root of 11
= 21 √11
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