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panjang = 2x
luas = 50
luas = p x l
50 = 2x × x
50 = 2x²
x² = 50 :2
x² = 25
x = √25
x = 5
keliling = 2(p+l)
keliling = 2(2x + x)
keliling = 2(3x)
keliling = 6x
keliling = 6 × 5
keliling = 30 cm
luas = p xl
50 = 2l x l
50 = 2l"
50 : 2 = l"
25 = l"
l = akar 25
l = 5
p= 2.l = 2.5 = 10
keliling = 2(p+l)
=2(10+5)
=2(15)
=30
jadi kelilingnya adalah 30