Topic: symmetry

Unit: GeometryPrathomsuksa 5

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VOCABULARY

symmetry (n.)

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

halve (v.) to divide

(something) into two equal portions or parts

vertical (adj.) in an up-

down position; Upright

horizontal

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

STRUCTURE

Singular and Plural Nouns

Singular and Plural NounsA noun names a person, place, thing, or idea.

For the plural form of most nouns, add s.

bottle – bottlescup – cupsline - lines

For nouns that end in ch, x, s, or s sounds, add es.

box – boxeswatch – watchesmoss – mosses

bus – buses

For nouns ending in f or fe, change f to v and add es.

wolf – wolveswife – wiveslife – lives

Some nouns have different plural forms.

child – childrenwoman – women

mouse – mice

Nouns ending in vowels like y or o do not have definite rules.

toy – toyspotato – potatosmemo – memos

A few nouns have the same singular and plural forms.

sheep – sheepdeer – deer

species – species

TEXTSYMMETRY

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

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

Basic type of line symmetry

1. Vertical line 2.

Horizontal line

vertical line

horizontal line

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

Symmetry is all around us.

Symmetry can be found in art,

Symmetry can be found in nature,

Symmetry can be found in math,

even in the mirror

Check your understanding

Is this symmetrical?

Is this symmetrical?

Is this symmetrical?

Is this symmetrical?

ACTIVITY

PAINTINGDirection1. Get a piece of paper and color2. Draw your picture with a symmetry3. Show your work and present in

front of class

Miss Jirapat Chomvilai 54010513010 4ENMiss Thunyachon Ladawan 54010513047 4ENMr. Narunon Prathammasarn 54010513047 4EN

THANK YOU