2
18/2=9
18cm 2
Area = 0.5*base*height Note that the given dimensions would not form a triangle
An arbitrary large number is the answer for anyrectangle, up to that with a length of 9cm, and 0cm as the width will have a perimeter of 18cm.Similarly, any rectangle up to that with sides 0cm long, and a width of 9cm will have your 18cm perimeter.
The equation for circumference is C = 2*pi*r, where r is the radius of the circle and pi is a constant = 3.14159... Assuming that you mean a 9cm radius, the circumference is therefore: C = 2*pi*r = 2*pi*9cm = 18cm*pi = ~56.549cm
83
9cm
900cm
The length of the rectangle is 18cm. The width of the rectangle is 9cm.
0.09 cm
13mm
90mm divided by 10 = 9cm
If each pixel is 1 cm in length. 13 times 9cm equals 117 pixels in length.