The Congruent Triangles

Catatan ke-14

A. Triangle

Triangle is one of plane figures. The requirements for the congruent of two triangles:

• The corresponding sides have the same length; and
• The corresponding angles have the same size.

B. Example

See at the figures below! The triangle ABC and the triangle DEF. Determine whether the couples of the following triangles are congruent or not?

Answer:

• First, let ?ABC and ?DEF. If ?ABC is moved to the right as long as AD. So, ?ABC will closing ?DEF with exactly.

• Second, the requirenments for the congruence of triangles.
• Solution for the lengths:

• AB = DE
• BC = EF
• CA = FD
• I got that the corresponding lengths are equal.

• Solution for the angles:

• ?ABC = ?DEF
• ?BCA = ?EFD
• ?CAB = ?FDE
• And also, I got that the corresponding angles are similar.

• Last, because the requirements for the congruence of two triangles fulfilled,  I can say, ?ABC and ?DEF are congruent ? ?ABC ? ?DEF.

Happy blogging!

Ibnu Kahfi

Related Articles:

Math

• Two Congruent Plane Figures

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