Toan hoc 3 Hinh chu nhat

Math
Rectangles


A

B

D

C

Rectangle ABCD has:
Do:
- 4 angles A,B,C,D are right.
Use -the
square
to check of:
4 angles
4 sides
are composed
2 long
Use
rulerCD,to2measure
sidesthe
AB and
short sidesthe
AD and
rectangles’
sides
BC.

- AB = CD , AD = BC.

A rectangle has 4 right angles, 2 long
equal sides, 2 short equal sides


RECTANGLES, WHERE ARE YOU?


RULE: Choose the rectangles and stick
on the board as fast as possible.


2. Measure and state the length of
sides of each of the following
rectangles:
4cm
5cm

2cm

3cm


3. Find the length and width of
each rectangle in the diagram:
a)
1cm

A

4cm

2cm

M

4cm

B
1cm
N
3cm
2cm

-The width BC of rectangle
ABCD is:
1 + 2 = 3 (cm)
- The length AB is: 4cm
- The length MN is: 4cm
- The width AM is: 1cm
- The width MD is: 2cm

D

4cm

C

b)
A 1cm E

4cm

B
- The length EB is: 5 -1 = 4 (cm)

4cm

4cm

4cm

-The length BC is: 4cm
- The length EF is: 4cm
- The width DF is: 1cm

D

1cm F

C
5cm


4. Draw one more line segment to
create a rectagle

Homework

How to create a rectangle using only
3 matches?