Splash Screen. Five-Minute Check (over Lesson 1–5) 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
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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, irregularExample 1
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, irregularExample 1
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
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 inchesExample 3