A rectangle has a length of 5 centimeters and a width of 3 centimeters. Find the perimeter.

Solution 1: P = 5cm + 3cm + 5cm + 3cm = 16cm

Solution 2: P = 2(5cm) + 2(3cm) = 10cm + 6cm = 16cm

The radio of a circle is 2 inches. What is the circumference?

, that is C=2·3.14·2=12.56 inches