There are many possible answers. You could draw a 4 cm x 7 cm rectangle and remove a 1 cm x 3 cm rectangle from it.
Draw two long parallel lines, both 4 cm, 2 cm apart, then draw the other two lines of the rectangle. You can measure the perimeter if you want. It's exactly 12 cm.
The answer is 12 cm.
To draw a rectangle that's 20 by 15 meters on a A4 piece of paper you could add a scale perhaps for every 1 cm drawn on the paper would be 5 meters in reality. Doing this would allow you do simply draw a 4 by 3 cm rectangle. You could however change the scale suit yourself.
The area of rectangle is : 24.0
Base of rectangle: 24/6 = 4 cm
Length of rectangle: 7.9 cm Width of rectangle: 1.3 cm Area of rectangle: 7.9 times 1.3 = 10.27 square cm
Draw a 10 x 20 rectangle.
Width of rectangle: 20/5 = 4 cm
width = (x + 4) cm length = [(x + 4) + (x + 7)] cm Rectangle Perimeter = 2[(x + 4) + (x + 4 + x + 7)] cm Rectangle Perimeter = 2[(x + x + x) + (4 + 4 + 7)] cm Rectangle Perimeter = 2(3x + 15) cm Rectangle Perimeter = (6x + 30) cm
The area of rectangle is : 28.0
The dimensions of the rectangle are 5 cm by 4 cm