keliling persegi panjang = 308 .Jika panjang = (8x -6)meter dan lebar = (6x -8)meter,tentukan luasnya
Matematika
ferdinandsanja
Pertanyaan
keliling persegi panjang = 308 .Jika panjang = (8x -6)meter dan lebar = (6x -8)meter,tentukan luasnya
1 Jawaban
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1. Jawaban ariza10
K = 2 (P+L)
308 = 2 ( 8x - 6 + 6x - 8)
308 = 2 ( 14x - 14)
308 = 28x - 28
308 +28 = 28x
336 = 28x
x = 336/28
x = 12
P = 8x - 6 = 8(12) - 6 = 96 - 6 = 90
L = 6x - 8 = 6(12) - 8 = 72 - 8 = 64
Luas = P x L = 90 x 64 = 5.760 cm^2