bangun datar
segitiga
rumus heron
a = 10
b = 7
c = 12
S = keliling/2
S = (a + b + c)/2
S = (10 + 7 + 12)/2
S = 29/2
S = 14,5
Luas ∆ABC
= √(S(S - a)(S - b)(S - c))
= √(14,5 (14,5 - 10)(14,5 - 7)(14,5 - 12))
= √(14,5 × 4,5 × 7,5 × 2,5)
= √(29/2 × 9/2 × 15/2 × 5/2)
= √(29 × 3 × 9 × 25/16)
= 3 × 5/4 √(29 × 3)
= 15/4 √87 satuan luas
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Verified answer
bangun datar
segitiga
rumus heron
a = 10
b = 7
c = 12
S = keliling/2
S = (a + b + c)/2
S = (10 + 7 + 12)/2
S = 29/2
S = 14,5
Luas ∆ABC
= √(S(S - a)(S - b)(S - c))
= √(14,5 (14,5 - 10)(14,5 - 7)(14,5 - 12))
= √(14,5 × 4,5 × 7,5 × 2,5)
= √(29/2 × 9/2 × 15/2 × 5/2)
= √(29 × 3 × 9 × 25/16)
= 3 × 5/4 √(29 × 3)
= 15/4 √87 satuan luas