Geometry review

### 1.1. Knowledge to remember

**a. Rectangle – Quadrilateral**

**b. Line segment, line and three collinear points**

### 1.2. Math forms

**Type 1: Determine the name of the given shape or find the shape.**

The problem often asks to find quadrilaterals, rectangles, line segments, lines in the given shapes.

OLD*solution:* Recall the image of the desired shape and select the shapes with similar shapes.

**Form 2: Counting pictures**

From a given figure requires finding the number of shapes.

*Solution:*

– Counting single shapes

– Match single shapes into satisfying larger shapes and continue counting to the end.

**Form 3: Draw or draw more shapes to get a shape that satisfies the condition of the problem.**

The problem requires drawing one or more lines to a given figure so that the figure has an arbitrary number of triangles and quadrilaterals.

*Solution:*

– Using a straightedge, draw more lines and count the shapes.

– Choose the drawing method that meets the requirements of the problem.

### 1.3. Solving Textbook Exercises

**Lesson 1**

What is each picture below?

__Solution method__

Identify the names of the given shapes.

__Solution guide__

a) Triangle b) Quadrilateral c) Quadrilateral.

d) Square c) Rectangle g) Square.

**Lesson 2**

a) Draw a line segment of length 8cm.

b) Draw a line segment of length 1dm.

__Solution method__

– Use a pencil and ruler.

– Mark a point, place the ruler so that it coincides with the 0cm line; Mark the remaining point coincident with the line of the length to be drawn.

– Keeping the ruler in place, use a pencil to connect the two points you just marked along the edge of the ruler.

– Name 2 points of each line segment. From there, I got the line to draw.

__Solution guide__

a) Use a ruler with centimeter divisions, a point at the 0 line and mark the point at the 8 line, and then connect the two points.

b) Use a ruler with centimeter divisions, a point on the 0 line and mark a point on the 10 mark, and then connect the two points.

Name three collinear points (use a ruler to check)

__Solution method__

– Applying knowledge: If three points lie on the same line, then the three points are collinear.

– Put the ruler on three points in the given points, if they are on the same edge of the ruler, it is 3 points in line.

__Solution guide__

Three points A, B, E are collinear.

Three points D, E, C collinear

The three points D, B, I are in line.

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