1. TRIANGLES
ISOSCELES EQUILATERAL
TRIANGLES TRIANGLES
SCALEN
TRIANGLES

2. CONGRUENT FIGURES : CONGRUENT FIGURES
ARE THE FIGURES WHICH HAVE EQUAL SIZE
AND SHAPE IN SUCH A WAY THAT IF IT IS
COVERED BY AN OTHER PAIR OF SAME FIGURE
OVER IT THEY COVER EACH OTHER
COMPLETELY.
SIMILARLY, A TRIANGLE OF SAME SIZE AND
SHAPE COVERS AN OTHER TRIANGLE OF SAME
MEASUREMENTS IS KNOWN TO BE A
CONGRUENCE OF TRIANGLES .

3. 50 50
4 cm 4 cm
This is the first criterion for congruence of
triangles.
SAS Congruence rule: Two triangles are
congruent if two sides and the included angle
of one triangle are equal to the two sides and
the included angle of the other triangle.

4. 60 45 60 45
4 cm 4 cm
ASA Congruence Rule: Two triangles
are congruent if two angles and the
included side of one triangle are equal
to two angles and the included side of
other triangle .

5. 4 cm 4 cm
SSS Congruence rule: If three sides
of one triangle are equal to the
three sides of another triangle, then
the two triangles are congruent.

6. 4 cm 4 cm
RHS Congruence rule: If in two right triangles
the hypotenuse and one side of one triangle
are equal to the hypotenuse and one side of
the other triangle are congruent.
Right angle= hypotenuse-side