Pertanyaan :
Jawaban :
Keliling = 2(p+l)
36= 2( x+x+4)
36 = 2 (2x+4)
36 = 4x+8
36-8 = 4x
28 =4x
x = 7
36= 2( x+x+4)
36 = 2 (2x+4)
36 = 4x+8
36-8 = 4x
28 =4x
x = 7
panjang = x + 4
= 7 + 4 = 11cm
lebar = 7cm
luas = 11 x 7 = 77cm²