Question

Diketahui keliling sebuah persegi panjang 70cm.jika luas persegi panjang itu 300cm^2 mk pnjng diagonal persegibpanjang itu adl?

Answer 1

Kliling = 2 ( p + l)
70 = 2(p + l)
35= p+l
l = 35 - p

p x l = 300
p x (35- p ) =300
-p²  + 35p - 300 = 0
p² - 35 + 300 = 0
( p  - 20) ( p - 15)
maka p = 20
  otomatis l = 15

p² + l² = D²
400+225 = D²
√625 = D
D= 25cm

Answer 2

Kliling = 2 ( p + l)
70 = 2(p + l)
35= p+l
l = 35 - p

p x l = 300
p x (35- p ) =300
-p²  + 35p - 300 = 0
p² - 35 + 300 = 0
( p  - 20) ( p - 15)
maka p = 20
  otomatis l = 15

p² + l² = D²
400+225 = D²
√625 = D
D= 25cm