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Posted on April 24, 2022 (Updated on July 9, 2025)

What is hypotenuse angle congruence?

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Hypotenuse-Angle Congruence If the hypotenuse and an acute angle of a right triangle are congruent to the hypotenuse and corresponding acute angle of another right triangle, then the triangles are congruent. In the figure, ¯AC≅¯XZ and ∠C≅∠Z .

What is the hypotenuse angle congruence theorem?

The hypotenuse angle theorem, also known as the HA theorem, states that ‘if the hypotenuse and an acute angle of one right triangle are congruent to the hypotenuse and an acute angle of another right triangle, then the two triangles are congruent.

Does hypotenuse angle prove congruence?

In words, if the hypotenuse and a leg of one right triangle are congruent to the hypotenuse and a leg of a second right triangle, then the triangles are congruent. If in triangles ABC and DEF, angle A = angle D = right angle, AB = DE (leg), and BC = EF (hypotenuse), then triangle ABC is congruent to triangle DEF.

How do you prove hypotenuse leg congruence?

Video quote: So if you can prove that the angles are right angles the hypotenuse is the same and one of the legs are congruent then you can use the HL postulate to prove that two triangles are congruent.

What is right angle congruence?

Two right angled triangles are said to be congruent to each other if the hypotenuse and one side of the right triangle are equal to the hypotenuse and the corresponding side of the other right angled triangle.

How do you find a hypotenuse?

The hypotenuse is termed as the longest side of a right-angled triangle. To find the longest side we use the hypotenuse formula that can be easily driven from the Pythagoras theorem, (Hypotenuse)2 = (Base)2 + (Altitude)2. Hypotenuse formula = √((base)2 + (height)2) (or) c = √(a2 + b2).

What does LA mean in geometry?

Leg Acute (LA) Theorem



The LA Theorem has little to do with The City of Angels. The LA Theorem states: If the leg and an acute angle of one right triangle are both congruent to the corresponding leg and acute angle of another right triangle, the two triangles are congruent.

What is La congruence?

The LA in LA theorem refers to leg-acute. It states that if the leg and an acute angle of one right triangle are congruent to the corresponding leg and acute angle of another right triangle, then the triangles are congruent.

Why does HL hypotenuse leg work as a triangle congruence criterion?

In a right-angled triangle, the hypotenuse is the longest side which is always opposite to the right angle. The hypotenuse leg theorem states that two right triangles are congruent if the hypotenuse and one leg of one right triangle are congruent to the other right triangle’s hypotenuse and leg side.

What is LL ha la HL in geometry?

So we’ve learned about the LA, or leg-acute, theorem and the LL, or leg-leg, theorem. The HA theorem is the hypotenuse-angle theorem, and the HL theorem is the hypotenuse-leg theorem.

What does a ll B mean in geometry?

Line Segment “AB” AB. The line segment between A and B.

What information is needed in order to apply the hypotenuse leg HL theorem?

This theorem states that ‘if the hypotenuse and one leg of a right triangle are congruent to the hypotenuse and one leg of another right triangle, then the triangles are congruent. ‘ This is kind of like the SAS, or side-angle-side postulate. But SAS requires you to know two sides and the included angle.

What is the La theorem a special case of?

The LA theorem is a special case of the AAS theorem and the ASA postulate.

Which of the following is the Pythagorean Theorem?

The Pythagorean theorem states that in any right triangle, the square of the length of the hypotenuse equals the sum of the squares of the lengths of the legs of the right triangle. This same relationship is often used in the construction industry and is referred to as the 3-4-5 Rule.

How do you use AAS theorem?

The AAS Theorem says: If two angles and the non-included side of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent. Notice how it says “non-included side,” meaning you take two consecutive angles and then move on to the next side (in either direction).

What are the congruence theorems for right triangles?

Right Triangle Congruence

  • Leg-Leg Congruence. If the legs of a right triangle are congruent to the corresponding legs of another right triangle, then the triangles are congruent. …
  • Hypotenuse-Angle Congruence. …
  • Leg-Angle Congruence. …
  • Hypotenuse-Leg Congruence.


What is true of the hypotenuse of a right triangle?

The hypotenuse of a right triangle is always the side opposite the right angle. It is the longest side in a right triangle. The other two sides are called the opposite and adjacent sides.

What are the legs of a right triangle?

a and b are the “legs” of the triangle, which are the two sides that make up the 90 degree angle. c is the “hypotenuse” of the triangle, and is the side of the triangle that is opposite the right angle (another way to say a 90º angle is “right angle”). The hypotenuse is also the longest side of the right triangle.

What are the 3 triangle similarity theorems?

These three theorems, known as Angle – Angle (AA), Side – Angle – Side (SAS), and Side – Side – Side (SSS), are foolproof methods for determining similarity in triangles.

What is SSA similarity theorem?

SSA theorem



Two triangles are similar if the lengths of two corresponding sides are proportional and their corresponding angles across the larger of these two are congruent.

Is SSA a triangle similarity theorem?

Explain. While two pairs of sides are proportional and one pair of angles are congruent, the angles are not the included angles. This is SSA, which is not a similarity criterion. Therefore, you cannot say for sure that the triangles are similar.

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