# Are similar and congruent triangles the same?

When

**triangles**are**similar**, their angles are the same. But that does not mean that they have to be**congruent**. They can have the same angles but have sides of different lengths. So you can have two**triangles**where the angles are the same but where one has sides that**are all**3 times the length of the other, for example.A.

### Are triangles similar or congruent?

When triangles are similar, their

**angles**are the same. But that does not mean that they have to be congruent. They can have the same**angles**but have**sides**of different lengths. So you can have two triangles where the**angles**are the same but where#### What is a congruent triangle?

When two**triangles**are**congruent**they will have exactly the same three sides and exactly the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there.#### What are the special right triangles?

A**special right triangle**is a**right triangle**with some regular feature that makes calculations on the**triangle**easier, or for which simple formulas exist. For example, a**right triangle**may have angles that form simple relationships, such as 45°–45°–90°.#### How do you prove triangles are similar?

Angle-Angle (AA) Similarity Postulate - If two angles of one**triangle**are congruent to two angles of another, then the**triangles**must be**similar**. 2. Side-Side-Side (SSS) Similarity Theorem - If the lengths of the corresponding sides of two**triangles**are proportional, then the**triangles**must be**similar**. 3.

B.

### How can you determine congruence and similarity?

AA (Angle-Angle) If two pairs of corresponding angles in a pair of triangles are

**congruent**, then the triangles are similar. We know this because if two angle pairs are the same, then the third pair must also be equal. When the three angle pairs are all equal, the three pairs of sides must also be in proportion.#### What makes a right triangle?

The Pythagorean theorem states that: In any**right triangle**, the area of the square whose side is the hypotenuse (the side opposite the**right**angle) is equal to the sum of the areas of the squares whose sides are the two legs (the two sides that meet at a**right**angle).#### What are two figures with the same size and shape?

Two**figures**are similar if they have the**same shape**but not necessarily the**same size**. All of the**figures**below are congruent since they all have the**same shape**and**size**.#### What is a congruence transformation?

In mathematics, a**congruent transformation**(or**congruence transformation**) is: Another term for an isometry; see**congruence**(geometry). A**transformation**of the form A → P^{T}AP, where A and P are square matrices, P is invertible, and P^{T}denotes the transpose of P; see Matrix**Congruence**and**congruence**in linear algebra.

Updated: 2nd October 2019