Congruent triangles (SSS)
I can appreciate and use the criteria by which triangles are congruent (SSS).
Congruent triangles (SSS)
I can appreciate and use the criteria by which triangles are congruent (SSS).
Lesson details
Key learning points
- By knowing the three side lengths of the triangle and its image, you can prove congruence.
- The corresponding angle pairs will be the same.
Common misconception
Pupils may believe that as the sides fix the angles, that this implies it is true conversely.
Use any regular polygon to highlight that the angles will always be the same, but the edge lengths are not always the same length. Regular polygons are always similar but not necessarily congruent.
Keywords
Congruent - If one shape can fit exactly on top of another using rotation, reflection or translation, then the shapes are congruent.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
AB -
GF
CD -
EH
BC -
EF
∠DCB -
∠FEH
∠ADC -
∠EHG
∠DAB -
∠HGF
Square -
Rectangle
Parallelogram -
Rhombus
Isosceles trapezium -
Parallelogram
Kite -
Trapezium
Exit quiz
6 Questions
AB -
QR
BC -
PR
AC -
QP
ST = SV -
as ST and SV are both edges of the same square.
TU = VU -
as TU and VU are both edges of the same square.
SU -
is a common edge to both triangles.
a -
PQ
b -
QR
c -
PR