Perimeter

The PERIMETER is the distance around the edges.

Think:   peRIMeter.

Find the PERIMETER:

The perimeter would be:
	2' + 5' + 2' + 5' (This symbol:   '   indicates foot or feet)     or 2 times 2'   plus   2 times 5'     (2 * 2') + (2 * 5')     or 2 feet plus 5 feet TWICE:     2(2' + 5') = 2 * 7' = 14 feet

Although there are several formulas which can be used to find the perimeter, the easiest way to find the distance around the edges of a figure is to add all the sides together. When asked to choose an expression, you could figure out the actual quantity and then determine which of the expressions would yield that amount, or you may use the expressions, themselves, as a guide. Make a drawing whenever make the situation more clear (the drawing does not have to be accurate or 'to scale' it just needs to be usable).

Solve each problem; to check, click on the answer box:

Click here to check answer:The answer will appear here.

Which expression shows the perimeter of a rectangle that is 20 cm long and 10 cm wide?   (Hint: MAKE A DRAWING!)

20 * 10 2(20 * 10) 2 * 20 + 2 * 10 4(20 + 10) 2 * 20 - 2 * 10
Click here to check answerC. (the perimeter is 60 cm) (click on the answer box to check your results)

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1. What is the perimeter of a lawn that is 25 feet long and 20 feet wide?
   (HINT: You'd use this much fence around it.)

   Click here to check answer90 feet.

2. Find the perimeter of a table cloth that is sixty inches square.
   (HINT: Each edge is 60" long.)

   Click here to check answer240 inches (or 20 feet)

3. Which expression shows the perimeter of a rug that is 4 yards in length and 3 yards in width?   Find the perimeter.
   1. (4 * 4) + (4 * 3)
   2. (2 * 4) - (2 * 3)
   3. 2(4 + 3)
   4. 4 * 3
   5. 2 * 4 + 3

   Click here to check answerC. (perimeter is 14 yards)

   The length of a rectangle measures 60 meters and the width measures 40 meters.   Which of the following expressions shows the perimeter of the rectangle?   What is the perimeter?

   1. 2 * 60 * 40
   2. 60 * 40
   3. 4(60 * 40)
   4. (2 * 60) + (2 * 40)
   5. (2 * 60) - (2 * 40)

   Click here to check answerD. (perimeter is 200 meters)

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ANSWERS:


example:   C.   2 * 20 + 2 * 10   (60 centimeters)  


1)   90 ft.  

2)   240 in.  

3)   C.   (14 yds)  

4)   D.   (200 m)