Math 2 Lesson: Rectangle

### 1.1. Knowledge to remember

### 1.2. Math forms

**Form 1: Draw a rectangle or a quadrilateral.**

Based on the squares on the paper, connect the given points, satisfying the conditions to form the edges of the figure to be drawn.

**Form 2: Count the number of quadrilaterals or rectangles in the figure.**

– Count single shapes.

– Counting shapes made from single shapes

– Calculate the sum of the pictures found and answer.

**Form 3: Add a straight line to get the required shape.**

– Draw straight lines in the picture.

– Count the newly created shapes.

– Which drawing method has the number of shapes just created according to the requirements, choose that drawing method

### 1.3. Solving Textbook Exercises

**Lesson 1**

Use a pen and ruler to connect the points to get:

__Solution method__

Use a pencil and ruler to connect the points so that:

A rectangle has two equal long sides and two equal short sides.

A quadrilateral is a figure with four sides.

__Solution guide__

a) Connect four points A, B, C, D to get rectangle ABCD

b) Connect four points M, N, P, Q, we get quadrilateral MNPQ.

Lesson 2

How many quadrilaterals are there in each figure below?

__Solution method__

Count the shapes with four closed sides in each given shape.

__Solution guide__

Figure a) has a quadrilateral.

Figure b) has two quadrilaterals.

Figure c) has a quadrilateral.

lesson 3

Draw a line in the following figure to get:

a) A rectangle and a triangle

b) Three quadrilaterals

__Solution method__

– Use pencil and ruler to draw more lines into each shape.

– Count the quadrilaterals, triangles or rectangles in the picture just drawn, if it matches the required number of questions, that’s the way to draw.

__Solution guide__

a)

b)

.

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