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= 2(5x-1)
= 10x - 2 (Keliling)
b) 10x - 2 = 36 cm
10 x = 36 + 2
10x = 36+2
10x = 38
x = 38/10 = 3,8 cm
Panjang = 3x+2
= (3x3,8)+2
= 11,4 + 2
= 13,4 cm
Lebar = 2x-3
= 2(3,8) - 3
= 7,6 - 3
= 4,6 cm
Kalau salah maaf
= 2 (3x+2+2x-3)
= 2 (5x-1)
= 10x-2
b) 36 = 10x-2
36+2 = 10x
38 = 10x
3,8 = x
Panjang = 3 (3,8) + 2 = 13,4 cm
Lebar = 2 (3,8) - 3 = 4,6 cm
Jadi, ukuranya = 13,4 x 4,6 cm