14:46 | 21/12/2024

What are perimeter formulas? When do students in Vietnam learn about perimeter formulas?

What are perimeter formulas? When do students in Vietnam learn about perimeter formulas?

What are perimeter formulas?

The perimeter is the total length of the sides surrounding a shape. Students can refer to the summary table of perimeter formulas below:

Summary of Perimeter Formulas

Triangle

Formula: C = a + b + c

Where:

C: Perimeter of the triangle

a, b, c: Lengths of the three sides of the triangle

Rectangle

Formula: C = 2(a + b)

Where:

C: Perimeter of the rectangle

a: Length

b: Width

Square

Formula: C = 4a

Where:

C: Perimeter of the square

a: Length of one side

Circle

Formula: C = πd or C = 2πr

Where:

C: Perimeter of the circle

d: Diameter of the circle

r: Radius of the circle

π (pi): A constant approximately equal to 3.14

Parallelogram

Formula: C = 2(a + b)

Where:

C: Perimeter of the parallelogram

a, b: Lengths of two adjoining sides

Rhombus

Formula: C = 4a

Where:

C: Perimeter of the rhombus

a: Length of one side

Isosceles trapezoid

Formula: C = a + b + 2c

Where:

C: Perimeter of the isosceles trapezoid

a, b: Lengths of the two bases

c: Length of the side

*Note:

Unit of measurement: When calculating perimeter, ensure that all sides use the same unit of measurement.

Complex shapes: For more complex shapes, one can decompose the shape into simpler shapes, calculate the perimeter of each part, and then sum them.

*Example:

Calculating the perimeter of a rectangle: If the length is 5cm and the width is 3cm, the perimeter of the rectangle is: C = 2(5 + 3) = 16cm.

Calculating the perimeter of a circle: If the diameter of the circle is 10cm, the perimeter of the circle is: C = 3.14 * 10 = 31.4cm.

*Note: The information is for reference only./.

Summary of Perimeter Calculation Formulas. Which grade do students first learn perimeter calculation formulas?

What are perimeter formulas? When do students in Vietnam learn about perimeter formulas? (Image from the Internet)

When do students in Vietnam learn about perimeter formulas?

According to Section 5 of the Mathematics Curriculum of the General Education Program issued with Circular 32/2018/TT-BGDDT, the required achievements for Grade 3 Mathematics include:

Measurement

*Symbols of quantity and measurement units:

- Recognize “area” through specific symbols.

- Recognize the unit of area measurement: cm² (square centimeters).

- Recognize the unit of length measurement: mm (millimeters); understand the relationship between the units m, dm, cm, and mm.

- Recognize the unit of mass measurement: g (grams); understand the relationship between g and kg.

- Recognize the unit of capacity measurement: ml (milliliters); understand the relationship between l and ml.

- Recognize the unit of temperature measurement (°C).

- Recognize the denominations of Vietnamese banknotes (within the range of 100,000 VND); recognize the 200,000 VND and 500,000 VND banknotes (students are not required to read and write the denomination numbers).

- Recognize the months of the year.

Practical measurement

- Use some common tools (such as scales, rulers with millimeter divisions, thermometers,...) for practical weighing, measuring, pouring, and counting.

- Tell the time accurately to 5 minutes and each minute on the clock.

*Calculation and estimation with measured quantities

- Perform conversion and calculations with length measurements (mm, cm, dm, m, km); area (cm²); mass (g, kg); capacity (ml, l); time (minutes, hours, days, weeks, months, years); the Vietnamese currency learned.

- Calculate the perimeter of triangles, quadrilaterals, rectangles, and squares when the side lengths are known.

- Calculate the area of rectangles and squares.

- Make estimates of measurement results in some simple cases (e.g., the weight of a chicken is approximately 2kg,...).

- Solve practical problems related to measurement.

Thus, students first learn perimeter calculation formulas in Grade 3.

What are some activities in the Grade 3 Mathematics program in Vietnam?

According to Section 5 of the Mathematics Curriculum of the General Education Program issued with Circular 32/2018/TT-BGDDT, the required achievements for Grade 3 Mathematics include:

Some probability elements

Recognize and describe the possible (random) outcomes of an event

Recognize and describe the potential (random) outcomes of an event when conducting a simple experiment (e.g., recognizing two possible outcomes for the face of a coin when tossed once; recognizing two possible outcomes for the color of a ball taken from a closed box containing balls of two colors, green or red,...).

The school organizes several activities for students and can supplement other activities depending on specific conditions.

Activity 1: Practical application of mathematical knowledge, such as:

- Practicing activities related to calculation, measurement, and estimation, such as practicing calculating and estimating the perimeter and area of some flat surfaces in reality related to the shapes learned; practicing measuring, weighing, pouring, and estimating length, mass, capacity, temperature,...

- Practicing collecting, classifying, and organizing statistical data (according to specific criteria) on some statistical subjects in school, class.

Activity 2: Organize extracurricular activities (e.g., math learning games or "Fun Learning - Learning Fun" activities; games related to buying and selling, exchanging goods; assembling, folding, stacking shapes; tossing coins, dice,...) related to reviewing and reinforcing math knowledge.

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