Quadrilaterals and Polygons: Parallelograms

Think & Click: Perimeter and Area of a Parallelogram

Now, you try. Complete the Think & Click activity by looking at the problem below, thinking about it, and then clicking on the question to reveal the solution.

Find the perimeter and area of the parallelogram below.

parallelogram with horizontal side labeled 15 centimeters, vertical side labeled 6 centimeters and perpendicular height labeled 4 centimeters

P = 2(15) + 2(6) = 42 cm

A = 15(4) = 60 cm2

Find the value of a and b in the figure below. The perimeter is equal to 84 inches. The area is equal to 280 square inches.

parallelogram with horizontal side labeled 20 inches, vertical side labeled 3a plus 7 inches and perpendicular height labeled 8b minus 2 inches

P = 2(20) + 2(3a + 7) = 84

40 + 6a + 14 = 84

6a = 30

a = 5

A = 20(8b – 2) = 280

160b – 40 = 280

160b = 320

b = 2

Review Worksheet

Complete the review worksheet for this section before taking the quiz. Download the review worksheet, complete the questions, and then download the answer key to check your work. Make sure to ask your teacher any questions.