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Splash Screen. Five-Minute Check (over Lesson 1–5) CCSS Then/Now New Vocabulary Key Concepts: Polygons Example 1: Name and Classify Polygons Key Concepts: Perimeter, Circumference, and Area Example 2: Find Perimeter and Area Example 3: Standardized Test Example: Largest Area

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lesson menu

Five-Minute Check (over Lesson 1–5)

CCSS

Then/Now

New Vocabulary

Key Concepts: Polygons

Example 1: Name and Classify Polygons

Key Concepts: Perimeter, Circumference, and Area

Example 2: Find Perimeter and Area

Example 3: Standardized Test Example: Largest Area

Example 4: Perimeter and Area on the Coordinate Plane

Lesson Menu
5 minute check 1

Refer to the figure. Name two acute vertical angles.

A.AED and BEC

B.AEB and DEC

C.DEA and DEC

D.BEC and BEA

5-Minute Check 1
5 minute check 2

Refer to the figure. Name a linear pair whose vertex is E.

A.AED, BEC

B.AEB, BEA

C.CED,AEB

D.AEB, AED

5-Minute Check 2
5 minute check 4

1 and 2 are a pair of supplementary angles, and the measure of 1 is twice the measure of 2. Find the measures of both angles.

A.m1 = 60, m2 = 120

B.m1 = 100, m2 = 80

C.m1 = 100, m2 = 50

D.m1 = 120, m2 = 60

5-Minute Check 4
5 minute check 6

The supplement of A measures 140 degrees. What is the measure of the complement of A?

A. 40

B. 50

C. 80

D. 140

5-Minute Check 6
slide9

Content Standards

G.GPE.7 Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula.

Mathematical Practices

2 Reason abstractly and quantitatively.

6 Attend to precision.

CCSS
then now

You measured one-dimensional figures.

  • Identify and name polygons.
  • Find perimeter, circumference, and area of two-dimensional figures.
Then/Now
vocabulary

equiangular polygon

  • regular polygon
  • perimeter
  • circumference
  • area
  • polygon
  • vertex of a polygon
  • concave
  • convex
  • n-gon
  • equilateral polygon
Vocabulary
example 1

Name and Classify Polygons

A. Name the polygon by its number of sides. Then classify it as convex or concave and regular or irregular.

There are 4 sides, so this is a quadrilateral.

No line containing any of the sides will pass through the interior of the quadrilateral, so it is convex.

The sides are not congruent, so it is irregular.

Answer: quadrilateral, convex, irregular

Example 1
example 11

Name and Classify Polygons

B. Name the polygon by its number of sides. Then classify it as convex or concave and regular or irregular.

There are 9 sides, so this is a nonagon.

Lines containing some of the sides will pass through the interior of the nonagon, so it is concave.

Since the polygon is concave, it must be irregular.

Answer: nonagon, concave, irregular

Example 1
example 1a

A. Name the polygon by the number of sides. Then classify it as convex or concave and regular or irregular.

A. triangle, concave, regular

B. triangle, convex, irregular

C. quadrilateral, convex, regular

D. triangle, convex, regular

Example 1a
example 1b

B. Name the polygon by the number of sides. Then classify it as convex or concave and regular or irregular.

A. quadrilateral, convex, irregular

B. pentagon, convex, irregular

C. quadrilateral, convex, regular

D. quadrilateral, concave, irregular

Example 1b
example 2

Find Perimeter and Area

A.Find the perimeter and area of the figure.

P = 2ℓ + 2w Perimeter of a rectangle

= 2(4.6) + 2(2.3) ℓ = 4.6, w = 2.3

= 13.8 Simplify.

Answer: The perimeter of the rectangle is 13.8 cm.

Example 2
example 21

Find Perimeter and Area

A.Find the perimeter and area of the figure.

A = ℓw Area of a rectangle

= (4.6)(2.3) ℓ = 4.6, w = 2.3

= 10.58 Simplify.

Answer: The area of the rectangle is about 10.6 cm2.

Example 2
example 22

Find Perimeter and Area

B.Find the circumference and area of the figure.

≈ 25.1 Use a calculator.

Answer: The circumference of the circle is about 25.1 inches.

Example 2
example 23

Find Perimeter and Area

B.Find the circumference and area of the figure.

≈ 50.3 Use a calculator.

Answer: The area of the circle is about 50.3 square inches.

Example 2
example 2a

A. Find the perimeter and area of the figure.

A.P = 12.4 cm, A = 24.8 cm2

B.P = 24.8 cm, A = 34.83 cm2

C.P = 34.83 cm, A = 69.66 cm2

D.P = 24.4 cm, A = 32.3 cm2

Example 2a
example 2b

B. Find the circumference and area of the figure.

A.C ≈ 25.1 m, A ≈ 50.3 m2

B.C ≈ 25.1 m, A ≈ 201.1 m2

C.C ≈ 50.3 m, A ≈ 201.1 m2

D.C ≈ 201.1 m, A ≈ 402.1 m2

Example 2b
example 3

Largest Area

Terri has 19 feet of tape to mark an area in the classroom where the students may read. Which of these shapes has a perimeter or circumference that would use most or all of the tape?

A square with side length of 5 feet

B circle with the radius of 3 feet

C right triangle with each leg length of 6 feet

D rectangle with a length of 8 feet and a width of 3 feet

Read the Test Item

You are asked to compare the perimeters orcircumference of four different shapes.

Example 3
example 31

Largest Area

Solve the Test Item

Find each perimeter or circumference.

Square

P = 4s Perimeter of a square

= 4(5) s = 5

= 20 feet Simplify.

Circle

C = 2r Circumference

= 2(3) r = 3

= 6 Simplify.

≈ 18.85 feet Use a calculator.

Example 3
example 32

.

Largest Area

Right Triangle

Use the Pythagorean Theorem to find the length of the hypotenuse.

c2 = a2+b2 Pythagorean Theorem

= 62+62a = 6, b = 6

= 72 Simplify.

≈ 8.49 Use a calculator.

P = a + b + c Perimeter of a triangle

 6 + 6 + 8.49 Substitution

 20.49 feet Simplify.

Example 3
example 33

Largest Area

Rectangle

P = 2ℓ+2w Perimeter of a rectangle

= 2(8)+2(3)ℓ = 8, w = 3

= 22 feet Simplify.

The only shape for which Terri has enough tape is the circle.

Answer: The correct answer is B.

Example 3
example 34

Each of the following shapes has a perimeter of about 88 inches. Which one has the greatest area?

A. a rectangle with a length of 26 inches and a width of 18 inches

B. a square with side length of 22 inches

C. a right triangle with each leg length of 26 inches

D. a circle with radius of 14 inches

Example 3
example 4

Perimeter and Area on the Coordinate Plane

Find the perimeter and area of a pentagon ABCDE with A(0, 4), B(4, 0), C(3, –4), D(–3, –4), and E(–3, 1).

Example 4
example 41

By counting squares on the grid, we find that CD = 6 units and DE = 5 units. Use the Distance Formula,

to find AB, BC, and EA.

Perimeter and Area on the Coordinate Plane

Step 1

Example 4
example 42

Perimeter and Area on the Coordinate Plane

The perimeter of pentagon ABCDE is 5.7 + 4.1 + 6 + 5 + 4.2 or about 25 units.

Example 4
example 43

Perimeter and Area on the Coordinate Plane

Step 2

Divide the pentagon into two triangles and a rectangle.

Find the area of the triangles.

Area of Triangle1

Area of a triangle

Substitute.

Simplify.

Example 4
example 44

Perimeter and Area on the Coordinate Plane

Area of Triangle 2

Substitute.

Simplify.

Example 4
example 45

Perimeter and Area on the Coordinate Plane

Find the area of the rectangle.

Area of a rectangle

Substitute.

Simplify.

The area of pentagon ABCDE is 9 + 2.5 + 30 or 41.5 square units.

Answer:The perimeter is about 25 units and the area is 41.5 square units.

Example 4
example 46

Find the perimeter of quadrilateral WXYZ with W(2, 4), X(–3, 3), Y(–1, 0), and Z(3, –1).

A. 17.9

B. 22

C. 13.3

D. 9.1

Example 4