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.
OLDsolution: 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.
– 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.
– 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
What is the name of each of the following pictures?
Match the picture with the appropriate name.
Figure A corresponds to the name: Line AB.
Figure B corresponds to the name: Line segment AB.
Figure C corresponds to the name: OPQR bend road.
Figure D corresponds to the name: Triangle ABC.
Figure E corresponds to the name: MNPQ square.
Figure G corresponds to the name: Rectangle GHIK.
Figure H corresponds to the name: Quadrilateral ABCD.
– Dot the points to form a picture-like frame.
– Use a straightedge to connect the points to get a pattern.
Students draw their own pictures.
Add a line to the following figure to get:
a) Two triangles
b) A triangle and a quadrilateral
Use a straightedge to draw a straight line to satisfy the requirements of the problem.
You can draw a line like this:
In the figure below there are:
a) How many triangles?
b) How many rectangles?
– Count singles and jigsaws to count enough triangles or rectangles.
Enter picture name and count:
a) There are 5 triangles: AEG, ABE, BCE, CDE, ACE.
b) There are 3 rectangles: ABEG, BCDE, ACDG.