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Home > CC1MN > Chapter 9 > Lesson 9.3.3 > Problem 9-109

9-109.

This problem is a checkpoint for area and perimeter of polygons. It will be referred to as Checkpoint 9B.

For each figure below, find the area and the perimeter.

  1. A rectangle: width is 8 centimeters and length is 5 centimeters.

  1. A triangle with a base of 23 in, left side 11 in, and right side 17 inches. Two internal triangles are created by a line segment, of 7.7 in, drawn from the upper vertex, to the base, at right angles.

  1. A parallelogram, slanted right, with bottom, 27 cm, Left, 18 cm. A right triangle is created by a line segment of 17 cm, drawn from the top left vertex, to the bottom side, at a 90 degree angle to the bottom.

  1. A trapezoid with horizontal, parallel bases: bottom is 20 m, and top is 10 m, and non parallel legs, of 9 m, and 12 meters. A dashed line, labeled 8.8 m, perpendicular to both bases, connects the bases.

Check your answers by referring to the Checkpoint 9B materials materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 9B materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.

Answers and extra practice for the Checkpoint problems are located in the back of your printed textbook or in the Reference Tab of your eBook. If you have an eBook for Core Connections, Course 1, login and then click the following link:   Checkpoint 9B: Area and Perimeter of Quadrilaterals and Triangles

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