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186 = 2 × [(4x + 6) + (2x - 2)]
186 = 2 × (6x + 4)
186 = 12x + 8
12x = 186 - 8
12x = 178
x = 178 : 12
x = 14,83
a. p = 4x + 6
= 4 (14,83) + 6
= 59,32 + 6
= 65,32 cm
l = 2x - 2
= 2 (14,83) - 2
= 29,66 - 2
= 27,66 cm
b. L = p × l
= 65,32 × 27,66
= 1.806,7512 cm²
Keliling = 2(p + l)
186 = 2[(4x + 6) + (2x - 2)]
93 = 4x + 6 + 2x - 2
93 = 6x + 4
89 = 6x
14,83 = x
A. Ukuran
Panjang = 4.14,83 + 6 = 65,33
Lebar = 2.14,83 - 2 = 27,66
B. Luas = p x l
65,33 x 27,66 = 1807,0278 cm2