The document defines and describes various plane figures (two-dimensional shapes). It begins by defining what a plane figure is and then describes the key properties of circles, triangles, rectangles, rhombuses, squares, and trapezoids. For each shape, it provides the defining characteristics, such as a circle tracing a curve that is always the same distance from the center and a triangle being formed by 3 straight lines. It also classifies triangles based on their angles and sides. The document aims to teach the reader to define, identify, and draw the principal geometric plane figures.

1. PLANE FIGURES
PREPARED BY: ARRABIS, EDMARIE
COYOCA, FLORDELEN
YASE, MA. THERESA

2. 0BJECTIVES:
• I can define plane figures.
• I can enumerate all the principal
geometric plane figures.
• I can draw the different principal
geometric plane figures.

3. PLANE FIGURE
- are flat two-dimensional
(2D) shape. A plane figure
can be made of straight
lines, curved lines, or both
straight and curved lines.

4. PLANE FIGURES
PRINCIPAL GEOMETRIC PLANE FIGURE
THE CIRCLE
- The circle is a shape that
can be made by tracing a
curve that is always the
same distance from a point
that we call the
center. The distance
around a circle is called
the circumference of the
circle.

5. PLANE FIGURES
The Triangle
- The triangle is a
shape that is formed by
3 straight lines that are
called sides. There are
different ways of
classifying triangles,
according to their sides
or angles.

6. PLANE FIGURES
1. According to their angles:
•Right triangle: the largest of the 3
angles is a right angle.
•Acute Triangle: the largest of the 3
angles is an acute angle (less than
90 degrees).
•Obtuse Triangle: the largest of the 3
angles is an obtuse angle (more than
90 degrees).

7. PLANE FIGURES
2. ACCORDING TO THEIR SIDES:
•Equilateral Triangle: all 3 sides
are the same length.
•Isosceles Triangle: it has 2 (or
more) sides that are of equal
length. (An equilateral triangle
is also isosceles.)
•Scalene Triangle: no 2 sides
are of equal measure.

8. PLANE FIGURES
The Rectangle
- The rectangle is a shape
that has 4 sides. The
distinguishing characteristic
of a rectangle is that all 4
angles measure 90 degrees.

9. PLANE FIGURES
The
Rhombus- The rhombus is a shape
formed by 4 straight lines.
Its 4 sides measure the
same length but, unlike
the rectangle, any of all 4
angles measure 90
degrees.

10. PLANE FIGURES
The Square
- The square is a type of
rectangle, but also a type of
rhombus. It has
characteristics of both of
these. That is to say, all 4
angles are right angles, and
all 4 sides are equal in
length.

11. PLANE FIGURES
The Trapezoid
- The trapezoid also
has 4 sides. It has two
sides that are parallel
but the other 2 are not.

12. Evaluation:
Directions: Read the questions carefully and
provide what is being asked in each
number. Put your answer in the
space provide.
1. Name the following shapes or plane figurers:

13. 2. Define the following and draw their shapes:
a) Triangle
b) Square
c) Rectangle
d) Circle

14. 3. Write the names of two objects whose
shapes are:
a) Circular (like a circle)
b) Triangular (like a triangle)
c) Square
d) Rectangular (like a rectangle)

15. 4. Write the names of the shapes of the
following shapes:
a) Page of a book
b) Surface of a postcard
c) Surface of a scale

16. d) Shape of a handkerchief
e) Surface of one-rupee coin
g) Surface of an Indian bread