12 Pri WB Math P5.pdf

8/14/2019 12 Pri WB Math P5.pdf

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Mathematics Pratomsuksa 5 Chapter 11 Exercises

114

Types of quadrilateralsAll quadrilaterals have 4 straight sides and 4 angles.

Shape Name Angles Sides No of Axes

of symmetry

1.

Square 4 right angles 4 equal sides 4

2.

Rectangle 4 right angles

2 pairsof equalopposite

sides

2

3.

Rhombus

2 pairsof equaloppositeangles

4 equal sides 2

4.

Parallelo-gram

Equaloppositeangles

2 pairsof equalopposite

sides

0

5.

TrapeziumMay or may

not haveequal angles

1 pair ofparallel

oppositesides

0 or 1

6.

Kite1 pair ofequaloppositeangles

2 pairsof equaladjacent

sides

1

Perimeter of quadrilateralPerimeter of quadrilateral = sum of all sides

Area of rectangleArea of rectangle = length width

12 Quadri laterals

12 Pri Edu WB Math P5.indd 114 2/17/11 9:42:43 AM


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115

A Write the names of the following quadrilaterals.

1. 2. 3.

Rectangle Square Trapezium

4. 5. 6.

Parallelogram Rhombus Kite

B Tick () the correct statements. Cross () the incorrect

statements. Improve the incorrect statements.

1. All the sides of a square have the same length.

2. Each angle in a rhombus is a right angle.

None of the angles in a rhombus are right angles.

3. A trapezium has one pair of parallel opposite sides.

4. The opposite sides of a parallelogram are of the samelength and each angle is a right angle.

None of the angles in a parallelogram are right angles.



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116

C Draw the axis of symmetry for each quadrilateral. Then, llin the blanks.

1. 2.

Name: Rectangle

No. of axis of symmetry: 2

Name: Square


3. 4.

Name: Parallelogram


Name: Rhombus


5.6.

Name: Kite


Name: Trapezium




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117

D Draw the described quadrilaterals.

1. A square with sides of 4.5 cm

each

2. A square with sides of specified

length.

3. Square MNOP

4. A rectangle with a length of4 cm and a width of 2.5 cm.

5. Rectangle STUV 6. A rectangle with sides ofspecified length and width.



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118

E Find the perimeter of each of the following.

1.

Perimeter: 20 cm

2.

Perimeter: 18 cm

3.

Perimeter: 14 cm

4.

Perimeter: 13 m

5.

Perimeter: 14 cm

6.

Perimeter: 14 m

7.

Perimeter: 22 cm

8.

Perimeter: 32 cm



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119

F Show the working to nd the answers.

1. A rectangular sticker is 7 centimeters tall and 3 centimeters wide.What is its perimeter?

Number sentence:7 + 7 + 3 + 3 =

Answer:20 centimeters

2. Each side of a square playground is 10 meters long. What is theperimeter of the playground?


Answer:40 meters

3. A map of the world is 1.2 meters tall and 1.8 meters wide. What is itsperimeter?

Number sentence:1.2 + 1.2 + 1.8 + 1.8 =

Answer:6 meters

4. Jenny has a scrapbook with a width of 18 centimeters and a lengthof 35 centimeters. She wants to put a ribbon around the book todecorate it. How long is the ribbon?


Answer:106 centimeters



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120

G Find the area for each diagram.

1.

Area = 22 squarecentimeters

2.


3.


4.

Area = 32 squaremeters

5.


6.


7.

Area = 20 squarekilometers

8.

Area = 220 squarekilometers



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121

H Show the working to nd the answers.

1. Each side of a square playground is 10 meters long. What is the areaof the playground?

Number sentence:10 10 =

Answer:100 square meters

2. The area of a rectangular room is 80 square meters. It is 8 meterswide. How long is it?

Number sentence:80 8 =

Answer:10 meters

3. Sunees bedroom is tiled with 150 square tiles. Each tile is 30 cm long.What is the area of Sunees bedroom, in square centimeters?

Number sentence:150 30 30 =

Answer:135,000 square centimeters

4. A plot of land is 15 meters wide and 20 meters long. If the cost ofmowing the grass is 5 baht per square meter of land, how much does

it cost to mow the grass on that plot of land?

Number sentence:15 20 5 =

Answer:1,500 Baht



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Mathematics Pratomsuksa 5 Chapter 12 Mastery Practice

122

1. Each angle is a rightangle.

All sides have the samelength.

Which of the following isdescribed above?A RectangleB Square

C ParallelogramD Rhombus

2. What is the name of the linethat divides a shape into twoequal halves?A Axis of symmetryB SideC AngleD Diagonal

3.

The above diagram shows atrapezium. How many axes ofsymmetry does it have?A 1 C 3

B 2 D 4

4. Which of the following has themost axes of symmetry?A RhombusB KiteC RectangleD Square

5. What is perimeter?A The measurement of the

size of a figure

B The total length of all sidesof a figure

C The mass of the figure

D The height, width andlength of a figure

Questions 6 and 7 refer to thediagrams below.

P Q

R S

6. Which of the following

diagrams has the largest

perimeter?

A P C R

B Q D S

7. Which of the following

diagrams has the smallest

perimeter?

A P C R

B Q D S

M a s t e e r y P r a c t i c M a s t e e r y P r a c t i c



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12 Pri WB Math P5.pdf