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Congruence & Symmetry
3rd Grade
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Texas Essential Knowledge and Skills (TEKS):
3.9.A
identify congruent two-dimensional figures;
Texas Essential Knowledge and Skills (TEKS):
3.9.C
identify lines of symmetry in two-dimensional geometric figures.
3rd Grade Math - Congruence & Symmetry Lesson
Congruent
figures are the same size and same shape.
Example:
The two figures are the same shape.
However, they are not the same size.
So, the two figures are not congruent.
Example:
S
and
Z
appear to be congruent.
Q
and
X
appear to be congruent.
A figure has
line symmetry
if a line can divide the figure
such that each half is a mirror image of the other.
The line is referred to as a
line of symmetry
.
Example:
The F and the R do not have line symmetry.
The A and the M both have line symmetry.
Example:
The M, the A, and the T each have 1 line of symmetry.
The H has 2 lines of symmetry.
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