Lebar suatu persegipanjang sepertiga panjangnya. Jika keliling persegipanjang 56 cm, luas persegi panjang tersebut adalah ….

0 votes

asked Oct 15, 2016 in Matematika by admin (7,360 points)

Lebar suatu persegipanjang sepertiga panjangnya. Jika keliling persegipanjang 56 cm, luas persegi
panjang tersebut adalah ….

A. 126 cm2
B. 147 cm2
C. 243 cm2
D. 588 cm2

un-smp
matematika

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 votes

answered Oct 15, 2016 by admin (7,360 points)

Jawaban:B

PENJELASAN:

p = 3l
K = 2 (p + l)
56 = 2 (3l + l)
28 = 4l
l = 7 => p = 3 l = 3 x 7 = 21
Maka
L = p x l
L = 21 x 7 = 147 cm2

Lebar suatu persegipanjang sepertiga panjangnya. Jika keliling persegipanjang 56 cm, luas persegi panjang tersebut adalah ….

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

Please log in or register to add a comment.

Related questions

Most popular tags