the perimeter of a retangle is 54 cm. its lenght is twice its breadth. find the area of the rectangle
Matematika
eileenliko
Pertanyaan
the perimeter of a retangle is 54 cm. its lenght is twice its breadth. find the area of the rectangle
1 Jawaban
-
1. Jawaban kekeangelicaa
p = length; l = width
Perimeter = 2(p x l)
p = 2l
Perimeter = 2(2l x l)
54 = 2(2l²) = 4l²
54/4 = l²
13.5 = l²
l = √13.5
p = 2l = 2√13.5
Area = p x l = √13.5 x 2√13.5 = 2 x 13.5 = 27 cm²