GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
LESSON 3:
PRE-VISIT - PERIMETER AND AREA
OBJECTIVE: Students will be able to:
Distinguish between area and perimeter.
Calculate the perimeter of a polygon whose side lengths are given or can be determined.
Calculate the area of a polygon whose side lengths are given or can be determined.
TIME REQUIRED: 1 class period
MATERIALS NEEDED:
Copies of the “Shape & Angle Review” worksheet (Included) – 1 for each student
Copies of the “World’s Biggest Fan” worksheet (Included) – 1 for each student
Students’ Geometry Dictionaries started in Lesson 1
Rulers
Protractors
Graph Paper
Pencils
VOCABULARY:
Area - The surface inside a figure or shape
Length - The measured distance from one end to the other of the longer side of an object
Line Segment – A part of a straight line included between two points
Perimeter - The distance around the outside of a polygon
Polygon – A closed figure made up of line segments
Width - The measured distance from one end to the other of the shorter side of an object
GEOMETRY
Circling the Bases
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
APPLICABLE TEKS STATE STANDARDS:
Lesson 3
3.6C, 3.6D, 3.6E, 3.7B and Process Standards 3.1A, 3.1B, and 3.1F
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
LESSON 3:
LESSON & ACTIVITY
1| Begin the lesson by providing students with copies of the “Shape & Angle Review”
worksheet (included).
2| Have students identify different shapes and angles evident on a baseball field as a
warm-up for this lesson.
3| Explain that today you will be discussing different ways to measure shapes. Review the
following definitions:
Length - The measured distance from one end to the other of the longer side of an object
Width - The measured distance from one end to the other of the shorter side of an object
4| Have students add “length” and “width” (and all following vocabulary words) to their
Geometry Dictionaries.
5| Explain that perimeter is the measure of the distance around the outside of a polygon. It
is found by adding the lengths of all sides of a figure. Sometimes the lengths of each side
are given; sometimes the lengths will need to be measured.
6| On the board, draw a rectangle labeled with a length of 4 feet and width of 3 feet.
Then draw a right triangle with a base of 4 feet, height of 3 feet, and a hypotenuse of 5 feet.
Demonstrate that to measure the perimeter of any polygon, the lengths of each side are
added.
7| Provide students with the formula to find the perimeter of a rectangle:
Perimeter = 2 x (length + width)
8| Remind students that rectangles have two pairs of matching sides.
Opposite sides are equal. Squares have four equal
sides, so if the length of one side is known, the
lengths of all other sides are known as well.
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
LESSON 3:
LESSON & ACTIVITY - CONTINUED
9| Draw a diagram of a baseball field as shown below. Discuss that the infield is commonly
known as the “baseball diamond.” Home plate, first, second, and third bases make up the
four points of the diamond.
10| Ask students to identify what other shape could be used to describe the baseball
diamond.
11| The baseball “diamond” is a square. Review that a square is a quadrilateral with all sides
of equal length and all angles measuring 90 degrees. Point out that each side of the
baseball diamond measures 90 feet. Have students determine the perimeter of the
baseball diamond.
12| Review that 90’ + 90’ + 90’ + 90’ = 360’.
13| Explain that the area of a figure measures the amount of space inside it.
Area is measured using square units. For example, if
inches are used to measure length, then the area will
be measured in square inches.
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
LESSON 3:
LESSON & ACTIVITY - CONTINUED
14| Show students that square units are indicated with a superscript 2 following the units of
measure. For example, 90’².
15| Provide students with the formula to find an object’s area:
Area = length x width
16| Have students determine the area of the infield drawn previously.
17| Review that 90’x 90’ = 8100’²
18| Provide each student with a copy of the “World’s Biggest Fan” worksheet (included) and
have students work independently to find the area and perimeter of each shape.
CONCLUSION:
To conclude this lesson and check for understanding, review each worksheet answer as
a class. Then have each student answer the following questions independently on their
own paper. “What is the difference in length between the longest and shortest
perimeters on the worksheet? What is the difference in area between the smallest and
largest rectangles on the worksheet? Explain the processes you used to get both
answers.”
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
SHAPE & ANGLE REVIEW
DEFINING SHAPES & ANGLES
Using the baseball field below, locate the following shapes and angles:
1| Square
2| Rectangle
3| Circle
4| Diamond
5| Triangle
6| Right angle
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
WORLD’S BIGGEST FAN
NAME|
DATE|
INSTRUCTIONS:
1|
You want your bedroom at home to show that you’re a HUGE baseball fan. Figure out the
perimeter and area of each of the following posters. Show your work alongside each
problem, or on a separate sheet of paper.
2O”
1O”
2O”
PERIMETER|
6”
2|
1O”
1O”
3.5”
3.5”
PERIMETER|
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CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
WORLD’S BIGGEST FAN
9.5”
3|
12”
12”
9.5”
PERIMETER|
AREA|
12”
4|
12”
12”
12”
PERIMETER|
AREA|
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
WORLD’S BIGGEST FAN
8”
5|
32”
32”
8”
PERIMETER|
6|
AREA|
5”
5”
5”
5”
PERIMETER|
AREA|
GEOMETRY
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GEOMETRY
CIRCLING THE BASES
HOUSTON ASTROS IN PARTNER WITH THE NBHOF
LESSON 3:
WORLD’S BIGGEST FAN ANSWER KEY
50”
1| Perimeter _________________
33”
2| Perimeter _________________
43”
3| Perimeter _________________
2
Area _________________
114”
48”
4| Perimeter _________________
2
Area _________________
80”
5| Perimeter _________________
2
Area _________________
18”
6| Perimeter _________________
2
Area _________________
144”
256”
20”
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