Download Identify Plane Figures - MathCoach Interactive

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MG 2.1
Describe 5HFRJQL]HDQGGUDZVKDSHVKDYLQJVSHFLILHGDWWULEXWHVVXFKDVD
and classify plane and solid geometric shapes (e.g.,
JLYHQQXPEHURIDQJOHVRUDJLYHQQXPEHURIHTXDOIDFHV,GHQWLI\WULDQJOHV
circle, triangle, square, rectangle, sphere, pyramid, cube,
TXDGULODWHUDOVSHQWDJRQVKH[DJRQVDQGFXEHV
UNDERLYING SKILLS AND CONCEPTS:
vocabulary (corner, side)
rectangular prism) according to the number and shape of faces,
edges, and vertices.
Identify Plane Figures
Geometry is all about shapes.
a
K
ey Ide
Plane figures have
sides and angles.
Angles are corners where
the sides meet.
circle
rectangle
square
triangle
Names of figures tell about their shape.
E x am p l E
1
Triangle (tri • angle) means
“three corners.”
B – © CSL Associates, Inc. All rights reserved.
All of these are triangles. They have
3 corners and 3 straight sides.
E x am p l E
2
Rectangle (rect • angle) means
“square corner.”
All of these are rectangles.
They have 4 square corners and
4 straight sides.
Squares are a special kind of rectangle.
E x am p l E
3
Circles and ovals do not have
straight sides.
They do not have angles.
Chapter 25 – Lesson 1
circle
oval
page 291
Name
P RAC T I C E
Which shape does not belong? Write the letter. Explain why.
1
2
A
A
B
B
D
C
D
C
D; it is not a triangle
3
4
B
C
D
Math
Reasoning
B
A
D
C
Geometry Puzzle
D; it is the only rectangle
MR 1.1
Which shape does not belong?
Explain how you decided.
The circle. It has no
angles (corners).
page 292
Chapter 25 – Lesson 1
B – © CSL Associates, Inc. All rights reserved.
A
C; it is not a square
5
A; it is not a rectangle
Name
P RAC T I C E
Which shape does not belong? Write the letter. Explain why.
1
2
A
A
B
B
D
C
D
C
A; it is not a rectangle
C; it is not a triangle
3
A
B
4
D
D
D; it is not a square
C
A; it is the only rectangle
Math
Reasoning
5
Geometry Puzzle
MR 1.1
Which shape does not belong?
Explain how you decided.
The triangle.
It has straight sides.
page 194
Home Resource and Homework
Chapter 25 Lesson 1
B – © CSL Associates, Inc. All rights reserved.
C
B
A
MCX94TEG2Ch01_30.v9.4.1 2/19/01 19:53 Page 535
Name
P RAC T I C E
Which shape does not belong? Write the letter. Explain why.
1
2
A
A
B
B
D
C
D
C
D; it is not a triangle
B – © CSL Associates, Inc. All rights reserved.
3
4
A
B
C
D
B
A
D
C
C; it is not a square
Math
Reasoning
5
A; it is not a rectangle
D; it is the only rectangle
Geometry Puzzle
MR 1.1
Which shape does not belong?
Explain how you decided.
The circle. It has no
angles (corners).
Chapter 25 – Lesson 1
Student Book Page
page 292
Name
P RAC T I C E
Which shape does not belong? Write the letter. Explain why.
1
2
A
A
B
B
D
C
D
C
A; it is not a rectangle
C; it is not a triangle
3
A
B
4
D
D
D; it is not a square
C
A; it is the only rectangle
Math
Reasoning
5
Geometry Puzzle
MR 1.1
Which shape does not belong?
Explain how you decided.
The triangle.
It has straight sides.
page 194
Home Resource and Homework
Chapter 25 Lesson 1
B – © CSL Associates, Inc. All rights reserved.
C
B
A