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1. Holt McDougal Geometry
1-5Using Formulas in Geometry
Objectives
Students will be able to apply perimeter,
area, and circumference formulas to
solve problem.

2. Holt McDougal Geometry
1-5Using Formulas in Geometry
The perimeterP of a plane figure is
the sum of the side lengths of the
figure.
The areaA of a plane figure is the
number of non-overlapping square
units of a given size that exactly
cover the figure.

3. Holt McDougal Geometry
1-5Using Formulas in Geometry
Perimeteris expressed in linear
units, such as inches (in.) or meters
(m).
Areais expressed in square units,
such as square centimeters (cm
2
).
Remember!

4. Holt McDougal Geometry
1-5Using Formulas in Geometry

5. Holt McDougal Geometry
1-5Using Formulas in Geometry
The basebcan be any side of a
triangle.
The heighthis a segment forms a
right angle with the base. The height
may be a side of the triangle or in the
interior or the exterior of the triangle.

6. Holt McDougal Geometry
1-5Using Formulas in Geometry
What’s my base and what’s my
height?

7. Holt McDougal Geometry
1-5Using Formulas in Geometry
Perimeter and Area with Algebra
Find the area and perimeter of each figure.
1.
2.
x
2
+ 4x; 4x + 8
10x; 4x + 16

8. Holt McDougal Geometry
1-5Using Formulas in Geometry
The circumferenceof a circle is the distance
around the circle.
“perimeter of the circle”

9. Holt McDougal Geometry
1-5Using Formulas in Geometry
(Pi) is often approximated as 3.14 or .

10. Holt McDougal Geometry
1-5Using Formulas in Geometry
Find circumference and area of circles
Find the area and perimeter of each circle.
1.
2.

11. Holt McDougal Geometry
1-5Using Formulas in Geometry
Find Circumference and Areas of Circles

12. Holt McDougal Geometry
1-5Using Formulas in Geometry
Find Circumference and Areas of Circles

13. Holt McDougal Geometry
1-5Using Formulas in Geometry
1.5 HW answer
1. 12 ft
2. 6 ft
2
3. 2.4 ft or ft
4. P9.6 m; A5.76 m
2
5. P2x20; A7x21
6. circumference
7. C44 mi; A154 mi
2
8. 2 in.
9. 19 m
10. 12.5 mm

14. Holt McDougal Geometry
1-5Using Formulas in Geometry
Apply Formulas of Perimeter, Circumference and Areas

15. Holt McDougal Geometry
1-5Using Formulas in Geometry
Apply Formulas of Perimeter, Circumference and Areas

16. Holt McDougal Geometry
1-5Using Formulas in Geometry

17. Holt McDougal Geometry
1-5Using Formulas in Geometry
Group wprk-Application in Real LIfe
A landscaper is installing a brick patio in the backyard. He is
building a rock wall around the perimeter of the patio.
1. What is the area needed for the brick patio?
2.What is the perimeter needed for building the brick wall?
28.56ft.