This document discusses symmetry in geometry. It defines symmetry as when one shape becomes exactly like another if flipped, slid, or turned. There are two basic types of line symmetry: vertical and horizontal. An object that has a line of symmetry is considered symmetrical. Symmetry can be found everywhere in art, nature, math, and mirrors. The document provides examples of symmetrical and non-symmetrical shapes and instructs students to draw a picture with symmetry and present it to the class.

1. Topic: symmetry
Unit: Geometry
Prathomsuksa 5

3. VOCABULARY

4. symmetry (n.)symmetry is when
one shape
becomes exactly
like another if you
flip, slide or turn
it

5. halve (v.)
to divide
(something) into
two equal
portions or parts

6. vertical
(adj.) in an up-
down
position;
Upright

7. horizontal
(adj.) going side-to-
side, like the
horizon

8. STRUCTURE

9. Singular and Plural
Nouns

10. Singular and Plural Nouns
A noun names a person, place, thing, or
idea.

11. For the plural form of most nouns, add
s.
bottle – bottles
cup – cups
line - lines

12. For nouns that end in ch, x, s, or s sounds,
add es.
box – boxes
watch – watches
moss – mosses
bus – buses

13. For nouns ending in f or fe, change f to v
and add es.
wolf – wolves
wife – wives
life – lives

14. Some nouns have different plural forms.
child – children
woman – women
mouse – mice

15. Nouns ending in vowels like y or o do not
have definite rules.
toy – toys
potato – potatos
memo – memos

16. A few nouns have the same singular and
plural forms.
sheep – sheep
deer – deer
species – species

17. TEXT
SYMMETRY

18. Symmetry is when one shape
becomes exactly like another if you
flip, slide or turn it.

20. The Line of Symmetry is the imaginary line
where you could fold the image and have
both halves match exactly.

24. Basic type of line
symmetry
1. Vertical line
2. Horizontal line

25. vertical line

26. horizontal line

27. We can find 1 line of symmetry or more
than 1 in items and images.
Object that has line of symmetry is called
symmetrical.

28. Symmetry is all
around us.Symmetry can be found
in art,

31. Symmetry can be found in nature,

35. Symmetry can be found
in math,

36. even in the
mirror

39. Check your
understanding

40. Is this symmetrical?

41. Is this symmetrical?

42. Is this symmetrical?

43. Is this symmetrical?

44. ACTIVITY

45. Direction
1. Get a piece of paper and color
2. Draw your picture with a symmetry
3. Show your work and present in
front of class

47. Miss Jirapat Chomvilai 54010513010 4EN
Miss Thunyachon Ladawan 54010513047 4EN
Mr. Narunon Prathammasarn 54010513047 4EN