sebuah kolam bentuk persegi panjang 35 cm jika keliling 100 cm maka luas nya???

Kll = 100 Cm
l = x
p = 35 Cm + x

Kll = 2 × ( p + l )
100 = 2 × ( 35 + x + x )
100 = 70 + 2x + 2x
100 - 70 = 4x
x = 30/4
x = 7.5 Cm

p = 35 + x
= 35 + 7.5
= 42.5 Cm

l = x
= 7.5 Cm

L.PersegiPanjang = p × l
= 42.5 × 7.5
= 318.75 Cm²


Semoga Membantu :) Maaf kalo salah
``»•^°Mystic°^•«``