Question

Persegi panjang, p= (3x - 7) cm, l= (2x), K = 66cm... Tentukan :
a. PLSV dan nilai x
b. p dan l
c. Luas persegi panjang

Answer 1

A)
2p + 2l = K
2( 3x - 7 ) + 2( 2x ) = 66
6x - 14 + 4x = 66
10x - 14 = 66
10x = 66 + 14
10x = 80
x = 8

b)
p = ( 3x - 7 ) cm
p = { 3( 8 ) - 7 }
p = 24 - 7 = 17 cm

l = ( 2x )
l = 2( 8 )
l = 16 cm

c)
L = p . l
L = 17 . 16
L = 272 cm²