MG 3.8
Know the definition of different quadrilaterals (e.g., rhombus,
square, rectangle, parallelogram, trapezoid).
UNDERLYING SKILLS AND CONCEPTS:
meaning of right angle;
parallel and perpendicular;
vocabulary
Classify Quadrilaterals
A quadrilateral has four sides and four angles.
a
K
parallelogram
rectangle
two pairs of sides of equal length
and two pairs of parallel sides
two pairs of sides of equal length
and four right angles
square
rhombus
trapezoid
four sides of equal length
and four right angles
four sides of
equal length
exactly two
parallel sides
Remember:
Parallel lines are lines drawn on a sheet of paper that never cross.
A right angle is a quarter turn, or 90° (like the corner of this page).
Quad
mean rilateral
s4s
ides.
E x am p l E
Which of these quadrilaterals are parallelograms?
Explain how you know.
A
B
C
D
Quadrilaterals B and C are parallelograms because they each have
two pairs of sides of equal length, and
two pairs of sides that are parallel.
As a hint for parallelogram, remember parallel.
page 304
Chapter 26 – Lesson 2
D – © CSL Associates, Inc. All rights reserved.
Quadrilaterals are classified according to their sides and angles.
ey Ide
Name
P RAC T I C E
Classify each quadrilateral.
1.
2.
square
3.
rhombus
4.
5.
parallelogram
rectangle
6.
trapezoid
rhombus
Answer each question.
D – © CSL Associates, Inc. All rights reserved.
7. Which quadrilateral has 4 equal sides and 4 right angles?
square
8. Which quadrilateral has only one pair of parallel sides?
trapezoid
9. Which quadrilateral has 4 equal sides and no right angles?
rhombus
10. Which quadrilateral has two pairs of equal
sides and no right angles?
parallelogram
11. Are all squares also rectangles?
Yes
12. Are all rectangles squares?
No
Math
Reasoning
Visual Thinking
MR 1.1
13. Cut out these four shapes.
Glue the four pieces on the square to the right so
that they don’t overlap and completely fill the square.
Chapter 26 – Lesson 2
page 305
MCX94.HW.CL.G4.FM&Lesson.v211
8/2/04
19:17
Page 204
Name
…at home!
P RAC T I C E
Classify each quadrilateral.
1.
2.
rhombus
4.
3.
parallelogram
5.
square
6.
rectangle
trapezoid
trapezoid
Answer each question.
parallelogram
8. Which quadrilateral has 4 equal sides and no right angles?
rhombus
9. Which quadrilateral has only one pair of parallel side?
trapezoid
10. Which quadrilateral has 4 equal sides and 4 right angles?
square
11. Are all rectangles also squares?
No
12. Are all squares also rectangles ?
Yes
Math
Reasoning
Visual Thinking
MR 1.1
13. Cut out these four shapes.
Glue the four pieces on the square to the right so
that they don’t overlap and completely fill the square.
page 204
Home Resource and Homework
Chapter 26 Lesson 2
D – © CSL Associates, Inc. All rights reserved.
7. Which quadrilateral has two pairs of equal
sides and no right angles?
MCX94TEG4Ch01_32.v8.5.2 2/26/01 19:05 Page 561
Name
P RAC T I C E
Classify each quadrilateral.
1.
2.
3.
square
rhombus
4.
5.
rectangle
6.
parallelogram
trapezoid
rhombus
Answer each question.
D – © CSL Associates, Inc. All rights reserved.
7. Which quadrilateral has 4 equal sides and 4 right angles?
square
8. Which quadrilateral has only one pair of parallel sides?
trapezoid
9. Which quadrilateral has 4 equal sides and no right angles?
rhombus
10. Which quadrilateral has two pairs of equal
sides and no right angles?
parallelogram
11. Are all squares also rectangles?
Yes
12. Are all rectangles squares?
No
Math
Reasoning
Visual Thinking
MR 1.1
13. Cut out these four shapes.
Glue the four pieces on the square to the right so
that they don’t overlap and completely fill the square.
Chapter 26 – Lesson 2
Student Book Page
page 305
Name
…at home!
P RAC T I C E
Classify each quadrilateral.
1.
2.
rhombus
4.
3.
parallelogram
5.
square
6.
rectangle
trapezoid
trapezoid
Answer each question.
parallelogram
8. Which quadrilateral has 4 equal sides and no right angles?
rhombus
9. Which quadrilateral has only one pair of parallel side?
trapezoid
10. Which quadrilateral has 4 equal sides and 4 right angles?
square
11. Are all rectangles also squares?
No
12. Are all squares also rectangles ?
Yes
Math
Reasoning
Visual Thinking
MR 1.1
13. Cut out these four shapes.
Glue the four pieces on the square to the right so
that they don’t overlap and completely fill the square.
page 204
Home Resource and Homework
Chapter 26 Lesson 2
D – © CSL Associates, Inc. All rights reserved.
7. Which quadrilateral has two pairs of equal
sides and no right angles?