Congruent Triangles
Rules for Triangle CongruencyCongruent triangles are triangles that have the same size and shape. This means that the corresponding sides are equal and the corresponding angles are equal. Show
We can tell whether two triangles are congruent without testing all the sides and all the angles of the two triangles. In this lesson,
we will consider the four rules to prove triangle congruence. They are called the SSS rule, SAS rule, ASA rule and AAS rule. The following diagrams show the Rules for Triangle Congruency: SSS, SAS, ASA, AAS and RHS. Take note that SSA is not sufficient for Triangle Congruency. Scroll down the page for more examples, solutions and proofs. Side-Side-Side (SSS) RuleSide-Side-Side is a rule used to prove whether a given set of triangles are congruent. The SSS rule states that: In the diagrams below, if AB = RP, BC = PQ and CA = QR, then triangle ABC is congruent to triangle RPQ. Side-Angle-Side (SAS) RuleSide-Angle-Side is a rule used to prove whether a given set of triangles are congruent. The SAS rule states that: An included angle is an angle formed by two given sides.
For the two triangles below, if AC = PQ, BC = PR and angle C< = angle P, then by the SAS rule, triangle ABC is congruent to triangle QRP. Angle-Side-Angle (ASA) RuleAngle-side-angle is a rule used to prove whether a given set of triangles are congruent. The ASA rule states that: Angle-Angle-Side (AAS) RuleAngle-side-angle is a rule used to prove whether a given set of triangles are congruent. The AAS rule states that: In the diagrams below, if AC = QP, angle A = angle Q, and angle B = angle R, then triangle ABC is congruent to triangle QRP. Three Ways To Prove Triangles CongruentA video lesson on SAS, ASA and SSS.
Using Two Column Proofs To Prove Triangles CongruentTriangle Congruence by SSS
Triangle
Congruence by SAS
Prove Triangle Congruence with ASA Postulate
Prove Triangle Congruence by AAS Postulate
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the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page. What are the 4 ways to prove triangles are congruent?These four criteria used to test triangle congruence include: Side – Side – Side (SSS), Side – Angle – Side (SAS), Angle – Side – Angle (ASA), and Angle – Angle – Side (AAS). There are more ways to prove the congruency of triangles, but in this lesson, we will restrict ourselves to these postulates only.
What are 5 ways to prove a triangle is congruent?There are 5 main rules of congruency for triangles:. SSS Criterion: Side-Side-Side.. SAS Criterion: Side-Angle-Side.. ASA Criterion: Angle-Side- Angle.. AAS Criterion: Angle-Angle-Side.. RHS Criterion: Right angle- Hypotenuse-Side.. How do you know △ ABC ≅ △ DEF explain?If two angle in one triangle are congruent to two angles of a second triangle, and also if the included sides are congruent, then the triangles are congruent. Using labels: If in triangles ABC and DEF, angle A = angle D, angle B = angle E, and AB = DE, then triangle ABC is congruent to triangle DEF.
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