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Posted on April 22, 2022 (Updated on July 9, 2025)

What is the postulate of a triangle?

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The sum of the angles of a triangle is two right angles. This postulate is equivalent to the parallel postulate.

How do you find the postulate of a triangle?

If the hypotenuse and one of the legs (sides) of a right triangle are congruent to hypotenuse and corresponding leg of the other right triangle, the two triangles are said to be congruent. If all three sides of a triangle are congruent to corresponding three sides of other triangle then the two triangles are congruent.

What is SSS SAS ASA AAS?

SSS (Side-Side-Side) SAS (Side-Angle-Side) ASA (Angle-Side-Angle) AAS (Angle-Angle-Side) RHS (Right angle-Hypotenuse-Side)

How do you find the postulate?

If you have a line segment with endpoints A and B, and point C is between points A and B, then AC + CB = AB. The Angle Addition Postulate: This postulates states that if you divide one angle into two smaller angles, then the sum of those two angles must be equal to the measure of the original angle.

What are the 7 postulates?

Terms in this set (7)

  • Through any two points there is exactly one line.
  • Through any 3 non-collinear points there is exactly one plane.
  • A line contains at least 2 points.
  • A plane contains at least 3 non-collinear points.
  • If 2 points lie on a plane, then the entire line containing those points lies on that plane.

Is SSA a thing in geometry?

The acronym SSA (side-side-angle) refers to the criterion of congruence of two triangles: if two sides and an angle not include between them are respectively equal to two sides and an angle of the other then the two triangles are equal.

How do I prove my SSS postulate?

Video quote: So once you get three congruent sides in a triangle you know that the triangle has to be congruent. So that's when you use side-side-side. It's actually one of the easiest postulates to see so let's

What is SSS postulate in a triangle?

Side-Side-Side



Or, if we can determine that the three sides of one triangle are congruent to three sides of another triangle, then the two triangles are congruent. We refer to this as the Side Side Side Postulate or SSS.

How do you know if a triangle is SSS?

The simplest way to prove that triangles are congruent is to prove that all three sides of the triangle are congruent. When all the sides of two triangles are congruent, the angles of those triangles must also be congruent. This method is called side-side-side, or SSS for short.

How do you know if a triangle is SSS or SAS?

If all three pairs of corresponding sides are congruent, the triangles are congruent. This congruence shortcut is known as side-side-side (SSS). Another shortcut is side-angle-side (SAS), where two pairs of sides and the angle between them are known to be congruent.

How do you tell if it’s ASA or AAS?

While both are the geometry terms used in proofs and they relate to the placement of angles and sides, the difference lies in when to use them. ASA refers to any two angles and the included side, whereas AAS refers to the two corresponding angles and the non-included side.

Is AAA a postulate?

(This is sometimes referred to as the AAA Postulate—which is true in all respects, but two angles are entirely sufficient.) The postulate can be better understood by working in reverse order. The two triangles on grids A and B are similar, by a 1.5 dilation from A to B.

What is a SAS postulate?

Postulate 12.2: SAS Postulate. If two sides and the included angle of one triangle are congruent to two sides and the included angle of a second triangle, then the triangles are congruent.

What is ASA geometry?

The Angle-Side-Angle Postulate (ASA) states that if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the two triangles are congruent.

Is SSA a postulate?

There are some cases when SSA can imply triangle congruence, but not always. This is why it’s not like the other triangle congruence postulates/criteria.

Is AAS and ASA same?

AAS congruence criterion is same as ASA congruence criterion.

What is an example of SSS?

Do write to us. Side Side Side Postulate-> If the three sides of a triangle are congruent to the three sides of another triangle, then the two triangles are congruent. Examples : 1) In triangle ABC, AD is median on BC and AB = AC.

What does SAS mean in math?

Euclidean geometry



first such theorem is the side-angle-side (SAS) theorem: If two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, the triangles are congruent.

How do you do SAS in geometry?

“SAS” is when we know two sides and the angle between them.



Solving SAS Triangles

  1. use The Law of Cosines to calculate the unknown side,
  2. then use The Law of Sines to find the smaller of the other two angles,
  3. and then use the three angles add to 180° to find the last angle.


What is AAS in math?

If two pairs of corresponding angles and the side between them are known to be congruent, the triangles are congruent. This shortcut is known as angle-side-angle (ASA). Another shortcut is angle-angle-side (AAS), where two pairs of angles and the non-included side are known to be congruent.

What is SSS math?

SSS (side-side-side) All three corresponding sides are congruent. SAS (side-angle-side) Two sides and the angle between them are congruent.

Is aas a postulate?

A quick thing to note is that AAS is a theorem, not a postulate. Since we use the Angle Sum Theorem to prove it, it’s no longer a postulate because it isn’t assumed anymore. Basically, the Angle Sum Theorem for triangles elevates its rank from postulate to theorem.

What is the hypotenuse leg theorem?

The HL Postulate states that if the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent.

Are all right triangles HL?

Correct answer:



Explanation: Right triangles are congruent if both the hypotenuse and one leg are the same length. These triangles are congruent by HL, or hypotenuse-leg.

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