Understanding Perimeter and Area of Polygons

How do you calculate the perimeter of a triangle with sides measuring 10, 12, and 8 units?

• Divide the sum of the sides by 3

• Add the lengths of all sides: 10 + 12 + 8

• Multiply the lengths of all sides: 10 * 12 * 8

• Subtract the smallest side from the largest side

If a square has one side measuring 5 units, what is its perimeter?

• 15 units

• 10 units

• 5 units

• 20 units

What is the area of a rectangle with a length of 4 units and a width of 2 units?

• 12 square units

• 10 square units

• 8 square units

• 6 square units

Which of the following rectangles has the same perimeter as a 2 by 4 rectangle but a different area?

• 4 by 4 rectangle

• 1 by 8 rectangle

• 3 by 3 rectangle

• 2 by 5 rectangle

What is the perimeter of a 1 by 8 rectangle?

• 16 units

• 18 units

• 20 units

• 22 units