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keliling = 13 + 14 + 15
keliling = 27 + 15 = 42 cm
luas
√s(s-a)(s-b)(s-c)
s=1/2 keliling
a,b,c = sisinya
s = 1/2 x 42 = 21
√21 (21-13)(21-14)(21-15)
√21(8)(7)(6)
√3 x 7 x 2 x 2 x 2 x 7 x 2 x 3
√3² x 7² x 2² x 2²
3 x 7 x 2 x 2
21 x 4
84 cm²