Name
LESSON
1-5
Date
Class
Practice A
Using Formulas in Geometry
Fill in the blanks to complete each statement.
The first one is done for you.
1. The sum of the
side lengths
of a plane figure is called the perimeter.
2. Give the formula for the perimeter of a rectangle.
P ⫽ 2ᐉ ⫹ 2w
area
of a plane figure is the number of nonoverlapping
3. The
square units of a given size that exactly cover the figure.
1 bh
A ⫽ __
2
4. The formula for the area of a triangle is
.
Use the figure for Exercises 5 and 6.
30 yd
5. Find the perimeter of the rectangle.
54 yd
6. Find the area of the rectangle.
YD
2
YD
Use the figure for Exercises 7 and 8.
7. Find the perimeter of the triangle.
24 cm
CM
2
8. Find the area of the triangle.
CM
24 cm
CM
Fill in the blanks to complete each statement.
diameter
is a segment that passes through the center
9. In a circle, a
of the circle and that has endpoints on the circle.
10. A radius of a circle is a segment whose endpoints are the
of the circle and a point on the circle.
11. Give the formula for the area of a circle.
center
A ⫽ ␲r 2
12. The circumference of a circle is the distance
around
13. Give the formula for the circumference of a circle.
C ⫽ 2␲r or C ⫽ ␲d
the circle.
Draw your answer in the space provided.
14. Draw a circle and label the
center, a diameter, and a radius.
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G1_IDEA_PA0105.indd Sec1:1
Holt Geometry
4/10/06 10:25:45 PM
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