# SSS and SAS

## The Power of SSS and SAS Shortcut Theorems

Do you wish to streamline your daily tasks? You're not alone. Many seek ways to simplify their lives. One efficient way is by using shortcuts or theorems to quickly determine if two or more triangles are congruent. In this article, we will delve into two of these shortcuts: SSS and SAS.

Triangle congruency can be determined if one of the following conditions exist between two or more triangles:

• SSS (Side-Side-Side)
• SAS (Side-Angle-Side)
• HL (Hypotenuse-Leg)
• ASA (Angle-Side-Angle)
• AAS (Angle-Angle-Side)

While we will focus on SSS and SAS in this article, stay tuned for future discussions on the remaining shortcuts.

## The SSS (Side-Side-Side) Shortcut

The SSS theorem is straightforward - if all three corresponding sides of two or more triangles are equal, then the corresponding angles are also equal. Thus, if the SSS condition is evident between two triangles, they are congruent.

For instance, imagine two equilateral triangles placed next to each other. An equilateral triangle has all equal sides. In this scenario, it is apparent that the triangles are congruent because they have equal angles and side lengths.

But what if the triangles are not adjacent to each other? The SSS shortcut is still applicable. As long as all three corresponding sides are equal, we can conclude that the triangles are congruent.

Now, let's consider a more complicated situation - what if the two triangles are rotated relative to each other? Are they still congruent? Yes, they are! In this case, we can use the SSS theorem to determine that the triangles are congruent because their corresponding sides are equal.

Why is this shortcut valuable? It allows us to quickly determine congruency without worrying about the triangles' position or orientation. As long as the sides are equal, we can confidently state that the triangles are congruent.

## The SAS (Side-Angle-Side) Shortcut

SAS stands for Side-Angle-Side, and it states that if two corresponding sides and the included angle between them are equal between two or more triangles, then the triangles are congruent.

This shortcut works because when we know the length of two sides and the angle between them, the length of the third side is predetermined. Therefore, if two triangles have two equal sides and the same angle between them, we can deduce that they are congruent.

For example, imagine two triangles with two equal sides and an included angle between them. By using the SAS shortcut, we can conclude that the triangles are congruent.

In another example, two triangles have equal angles and a shared side. Again, using the SAS shortcut, we can determine that the triangles are congruent.

By utilizing shortcuts such as SSS and SAS, determining triangle congruency becomes effortless. Simply identifying one of the conditions between two or more triangles allows us to promptly conclude they are congruent. As seen, these shortcuts are applicable, regardless of the triangles' position or orientation, making them practical and efficient tools for saving time.

## Understanding the SAS Theorem for Proving Triangle Congruence

When determining if two or more triangles are congruent, the SAS (Side-Angle-Side) theorem plays a crucial role. This theorem states that if all corresponding sides in the given triangles are equal, then congruence is established.

It's important to keep in mind that the order of the sides and angle must match when comparing the triangles. Triangle names are arbitrary and may not always be in a logical or alphabetical order. For example, if triangle ABC and XYZ have equal corresponding sides and angles, they are still congruent according to the SAS theorem.

Let's take a closer look at the differences between using SSS and SAS to prove congruence. The figure below displays three diagrams representing the SSS and SAS theorems. Our task is to determine if all three diagrams are congruent and which ones are SSS and SAS congruent.

• In diagram I, both triangles are congruent under the SAS theorem, as they share two equal sides and an angle.
• Diagram II follows the SSS theorem, as all three sides in both triangles are equal.
• Using the SAS theorem, both triangles in diagram III are congruent.

In summary, when examining triangle congruence, we must consider five main theorems: SSS, SAS, HL, ASA, and AAS. SSS (Side-Side-Side) states that if all corresponding sides of two or more triangles are equal, they are congruent. On the other hand, SAS (Side-Angle-Side) states that if two consecutive sides and the corresponding angle are equal, the triangles are congruent.

## Understanding SSS and SAS Theorems in Triangle Congruence

But what exactly are SSS and SAS? Both are theorems used to prove triangle congruence. SSS (Side-Side-Side) means that if two or more triangles have equal corresponding side lengths, then they are congruent. On the other hand, SAS (Side-Angle-Side) states that if two or more triangles have two equal corresponding sides and an equal included angle, they are congruent.

For instance, let's refer back to our examples with diagrams I, II, and III. If two consecutive sides and the corresponding angle are equal in both triangles, then the triangles are SAS congruent. On the other hand, if all corresponding sides are equal, the triangles are SSS congruent.

To illustrate, suppose we are given the area of triangle ΔMON as 60m2, angle ∠PRQ as 60°, and the length of line PR as 10m. By using the SAS theorem, we can determine the length of line QR.

## Key Takeaways: Understanding SSS and SAS Theorems for Triangle Congruence

In conclusion, knowing and applying the SSS and SAS congruence theorems is essential in determining if two or more triangles are congruent. These theorems highlight the significance of carefully considering all given information to arrive at the correct conclusion. With the SAS theorem, we can confidently prove the congruence of triangles in various geometric problems. Remember to keep the sides and angle order consistent when using this method.

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