Geometry B
Name:______________________
Date: ___________
Chapter 1: Foundations for Geometry
Section 5: Using Formulas in Geometry
Are you ready?
Evaluate. Round to the nearest hundredth.
1. 122
4.√𝟓𝟒
2. 7.62
5. 32()
3.√𝟔𝟒
6. (3)2
Objectives of Lesson: ________________________________________
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The perimeter ______________________________________________
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Perimeter and Area
Rectangle
Square
Triangle
The base _________________________________________________
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2
Remember: _______________________________________________
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Example 1: Finding Perimeter and Area
Find the perimeter and area of each figure.
Example 2: Finding Perimeter and Area
Find the perimeter and area of each figure.
Example 3: Finding Perimeter and Area
Find the perimeter and area of a square with s = 3.5 in.
Example 4: Crafts Application
The Queens Quilt block includes 12 blue triangles. The base and height of
each triangle are about 4 in. Find the approximate amount of fabric used to
make the 12 triangles.
3
Example 5: Find the amount of fabric used to make four rectangles. Each
rectangle has a length of 6½ in. and a width of 2½ in.
In a circle a diameter ________________________________________
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Circumference and Area of a Circle
The ratio _________________________________________________
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Example 6: Finding the Circumference and Area of a Circle
Find the circumference and area of a circle with radius 8 cm. Use the  key
on your calculator. Then round the answer to the nearest tenth.
4
Example 7: Find the circumference and area of a circle with radius 14m.
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