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3P = 7L
P = 7L/3 ......... (persamaan 1)
K = 180
Karena kelilingnya diketahui,
Rumus keliling:
K = 2(P + L)
Maka,
K = 2(7L/3 + L)
180 = 2(7L/3 + 1L/1)
180 = 2(10L/3)
180/2 = 10L/3
90 = 10L/3
90(3/10) = L
L = 27 .......(persamaan 2)
Masukkan persamaan 2 ke persamaan 1, maka
P = 7L/3
P = 7(27)/3
P = 189/3
P = 63
Rumus luas :
Luas = P x L
Maka,
Luas = P x L
Luas = 63 x 27
Luas = 1701