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Five-Minute Check (over Lesson 1–5) NGSSS 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 Practice Example 4: Perimeter and Area on the Coordinate Plane Lesson Menu

A B C D 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 A B C D 5-Minute Check 1

A B C D Refer to the figure. Name a linear pair whose vertex is E. A. AED, BEC B. AEB, BEA C. CED, AEB D. AEB, AED A B C D 5-Minute Check 2

A B C D Refer to the figure. Name an angle supplementary to BEC. A. AEB B. AED C. AEC D. CEB A B C D 5-Minute Check 3

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 A B C D 5-Minute Check 4

If RS is perpendicular to ST and SV is the angle bisector of RST, what is mTSV? 5-Minute Check 5

The supplement of A measures 140 degrees The supplement of A measures 140 degrees. What is the measure of the complement of A? A. 40 B. 50 C. 80 D. 140 A B C D 5-Minute Check 6

Also addresses MA.912.G.2.1 and MA.912.G.2.7. MA.912.G.2.5 Explain the derivation and apply formulas for perimeter and area of polygons. MA.912.G.2.6 Use coordinate geometry to prove properties of congruent, regular and similar polygons, and to perform transformations in the plane. Also addresses MA.912.G.2.1 and MA.912.G.2.7. NGSSS

You measured one-dimensional figures. (Lesson 1–2) Identify and name polygons. Find perimeter, circumference, and area of two-dimensional figures. Then/Now

polygon equiangular polygon regular polygon perimeter circumference area vertex of a polygon concave convex n-gon equilateral polygon Vocabulary

Concept

There are 4 sides, so this is a quadrilateral. 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

There are 9 sides, so this is a nonagon. 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. A line 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

A. Name each polygon by the number of sides A. Name each 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 A B C D Example 1a

B. Name each polygon by the number of sides B. Name each polygon by the number of sides. Then classify it as convex or concave and regular or irregular. A. quadrilateral, convex, regular B. pentagon, convex, irregular C. quadrilateral, convex, irregular D. quadrilateral, concave, irregular A B C D Example 1b

Concept

A. Find the perimeter and area of the figure. 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

A. Find the perimeter and area of the figure. 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

B. Find the circumference and area of the figure. 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

B. Find the circumference and area of the figure. 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

A B C D 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 A B C D Example 2a

A B C D 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 A B C D Example 2b

A square with side length of 5 feet B circle with the radius of 3 feet 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 or circumference of four different shapes. Example 3

Find each perimeter or circumference. 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

Use the Pythagorean Theorem to find the length of the hypotenuse. Right Triangle Use the Pythagorean Theorem to find the length of the hypotenuse. c2 = a2 + b2 Pythagorean Theorem = 62 + 62 a = 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

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

Each of the following shapes has a perimeter of about 88 inches 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 A B C D Example 3

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

Perimeter and Area on the Coordinate Plane Step 1 Example 4

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

Divide the pentagon into two triangles and a rectangle. 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 Triangle 1 Area of a triangle Substitute. Simplify. Example 4

Area of Triangle 2 Substitute. Simplify. Perimeter and Area on the Coordinate Plane Area of Triangle 2 Substitute. Simplify. Example 4

Find the area of the rectangle. 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

Find the perimeter of quadrilateral WXYZ with W(2, 4), X(–3, 3), Y(–1, 0), and Z(3, –1). B. 22 C. 13.3 D. 9.1 A B C D Example 4

End of the Lesson