10-1 finding perimeter course 1 homework & learning goal homework & learning goal aims prep...
TRANSCRIPT
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10-1 Finding Perimeter
Course 1
HOMEWORK & Learning GoalHOMEWORK & Learning Goal
AIMS PrepAIMS Prep
Lesson PresentationLesson Presentation
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Chapter 10 Section 16th Grade Math HOMEWORK
Page 502#6-22 EVENS
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Our Learning Goal
Students will be able to find the perimeter and area of polygons; find the area and circumference of circles and find the surface
area and volume of 3D shapes.
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Our Learning Goal Assignments• Learn to find the perimeter and missing side lengths of a
polygon.
• Learn to estimate the area of irregular figures and to find the area of rectangles, triangles, and parallelograms.
• Learn to break a polygon into simpler parts to find its area.
• Learn to make a model to explore how area and perimeter are affected by changes in the dimensions of a figure.
• Learn to identify the parts of a circle and to find the circumference and area of a circle.
• Learn to name solid figures.
• Learn to find the surface areas of prisms, pyramids, and cylinders.
• Learn to estimate and find the volumes of rectangular prisms and triangular prisms.
• Learn to find volumes of cylinders.
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Today’s Learning Goal Assignment
Learn to find the perimeter and missing side lengths of a polygon.
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Vocabulary
perimeter
Insert Lesson Title Here
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The perimeter of a figure is the distance around it. To find the perimeter you can add the lengths of the sides.
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Additional Example 1: Finding the Perimeter of a Polygon
Find the perimeter of the figure.
2.8 + 3.6 + 3.5 + 3 + 4.3
Add all the side lengths.
The perimeter is 17.2 in.
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Try This: Example 1
Find the perimeter of the figure.
3.3 + 3.3 + 4.2 + 4.2 + 3
Add all the side lengths.3.3 in. 3.3 in.
4.2 in.4.2 in.
3 in.
The perimeter is 18 in.
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Additional Example 2: Using a Formula to Find Perimeter
Find the perimeter P of the rectangle.
P = 2l+ 2w
Substitute 12 for l and 3 for w.P = (2 • 12) + (2 • 3)
P = 24 + 6
P = 30
Multiply.
Add.
The perimeter is 30 cm.
12 cm
3 cm
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Try This: Example 2
Find the perimeter P of the rectangle.
P = 2l + 2w
Substitute 15 for l and 2 for w.P = (2 • 15) + (2 • 2)
P = 30 + 4
P = 34
Multiply.
Add.
The perimeter is 34 cm.
15 cm
2 cm
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A. What is the length of side a if the perimeter equals 1,471 mm?
P = sum of side lengths
Use the values you know.1,471 = 416 + 272 + 201 + 289 + a
1,471 = 1,178 + a
1,471 – 1,178 = 1,178 + a – 1,178
Add the known lengths.
Subtract 1,178 from both sides.293 = a
Side a is 293 mm long.
Additional Example 3A: Finding Unknown Side Lengths and the Perimeter of a Polygon
Find each unknown measure.
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Try This: Example 3A
Find each unknown measure.
A. What is the length of side a if the perimeter equals 1,302 mm?
P = sum of side lengths
Use the values you know.1,302 = 212 + 280 + 250 + 240 + a
1,302 = 982 + a
1,302 – 982 = 982 + a – 982
Add the known lengths.
Subtract 982 from both sides.320 = a
Side a is 320 mm long.
212 mm 280 mm
a250 mm
240 mm
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Additional Example 3B: Finding Unknown Side Lengths and the Perimeter of a Polygon
Find each unknown measure.
B. What is the perimeter of the polygon?
First find the unknown side length.
Find the sides opposite side b.
The length of side b = 50 + 22.
Side b is 72 cm long.
P = 72 + 55 + 50 + 33 + 22 + 22
P = 254
Find the perimeter.
The perimeter of the polygon is 254 cm.
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72 cm
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First find the unknown side length.Find the sides opposite side b.
The length of side b = 12 + 4.
Side b is 16 m long.
P = 14 + 12 + 8 + 4 + 6 + 16
P = 60
Find the perimeter.
The perimeter of the polygon is 60 m.
Try This: Example 3B
Find each unknown measure.
B. What is the perimeter of the polygon?12 m
14 m
b m
8 m
6 m
4 m
16 m
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l = 4w Find the length.
l = (4 • 19)
l = 76
Substitute 19 for w.
Multiply.
Additional Example 3C: Finding Unknown Side Lengths and the Perimeter of a Polygon
C. The width of a rectangle is 19 cm. What is the perimeter of the rectangle if the length is 4 times the width?
4w
19 cm
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Additional Example 3C Continued
P = 2l + 2w
Substitute 76 and 19.P = 2(76) + 2 (19)
P = 152 + 38
P = 190
Multiply.
Add.
Use the formula for the perimeter of a rectangle.
The perimeter of the rectangle is 190 cm.
4w
19 cm
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l = 5w Find the length.
l = (5 • 13)
l = 65
Substitute 13 for w.
Multiply.
Try This: Example 3C
C. The width of a rectangle is 13 cm. What is the perimeter of the rectangle if the length is 5 times the width?
5w
13 cm
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Try This: Example 3C Continued
65 cm
13 cm
P = 2l + 2w
Substitute 65 and 13.P = 2(65) + 2 (13)
P = 130 + 26
P = 156
Multiply.
Add.
Use the formula for the perimeter of a rectangle.
The perimeter of the rectangle is 156 cm.
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Don’t forget your proper heading! Trade & Grade!
10-1 Lesson QuizFind each perimeter.
1. 2.
3. What is the perimeter of a polygon with side
lengths of 15 cm, 18 cm, 21 cm, 32 cm, and 26
cm?
4. What is the perimeter of a rectangle with
length 22 cm and width 8 cm?
9 cm
4 ft
Insert Lesson Title Here
112 cm
60 cm
56__
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6th Grade AIMS PrepWhen you play a game with a friend, there
are lots of tricks, or strategies, that you use to win the game.
Just like the game tricks, there are lots of test-taking tricks to help you “win” when
taking the AIMS Math Test.
What are some test-taking tricks that you use?
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AIMS Example 1What is the problem asking us to solve?
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Test-Taking Strategy #1Understand the problem!! Read It Thoroughly!
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