1. Two-Dimensional Figures Concept Checks
Lesson 1-6
Two-Dimensional Figures
Concept Checks

2. Click the mouse button or press the Space Bar to display the answers.
Check 1-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
Click the mouse button or press the Space Bar to display the answers.

3. Check 1-B
Concept Check
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

4. A. Find the perimeter and area of the figure.
Check 2-A
A. Find the perimeter and area of the figure.
A. P = 12.4 cm, A = 24.8 cm2
B. P = 24.8 cm, A = cm2
C. P = cm, A = cm2
D. P = 24.4 cm, A = 32.3 cm2

5. B. Find the circumference and area of the figure.
Check 2-B
B. Find the circumference and area of the figure.
A. C ≈ 25.1 m, A ≈ 50.3 m2
B. C ≈ 25.1 m, A ≈ m2
C. C ≈ 50.3 m, A ≈ m2
D. C ≈ m, A ≈ m2

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

7. Check 4
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