Congruence And Similarity Study Cards

Enhance Your Learning with Congruence and Similarity Flash Cards for quick learning



Congruent Figures

Figures that have the same shape and size, denoted by the symbol ≅.

Similar Figures

Figures that have the same shape but not necessarily the same size, denoted by the symbol ~.

Congruence Transformations

Transformations that preserve the shape and size of a figure, such as translations, rotations, and reflections.

Similarity Transformations

Transformations that preserve the shape of a figure but not necessarily the size, such as dilations.

Congruence Criteria

Conditions or rules that determine when two figures are congruent, such as side-side-side (SSS), side-angle-side (SAS), and angle-side-angle (ASA).

Similarity Criteria

Conditions or rules that determine when two figures are similar, such as angle-angle (AA), side-side-side (SSS), and side-angle-side (SAS).

Proportional Relationships

Relationships between corresponding sides or corresponding angles of similar figures, where the ratios are equal.

Triangle Similarity

The study of similar triangles and their properties, including the proportionality of corresponding sides and the equality of corresponding angles.

Congruence and Similarity Proofs

Logical arguments that use congruence and similarity criteria to prove the equality or proportionality of sides and angles in geometric figures.

Applications of Congruence and Similarity

Real-world situations where congruence and similarity concepts are used to solve problems, such as scaling objects, map navigation, and architectural design.

Corresponding Parts

The sides and angles of congruent or similar figures that occupy the same relative positions.

Scale Factor

The ratio of corresponding lengths of two similar figures.

Angle-Angle Similarity Postulate

If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

Side-Side-Side Congruence Postulate

If the corresponding sides of two triangles are congruent, then the triangles are congruent.

Side-Angle-Side Congruence Postulate

If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.

Angle-Side-Angle Congruence Postulate

If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent.

Angle Bisector Theorem

If a ray bisects an angle of a triangle, then it divides the opposite side into segments that are proportional to the other two sides.

Triangle Proportionality Theorem

If a line parallel to one side of a triangle intersects the other two sides, then it divides those sides proportionally.

SAS Similarity Theorem

If an angle of one triangle is congruent to an angle of another triangle and the lengths of the sides including these angles are proportional, then the triangles are similar.

SSS Similarity Theorem

If the lengths of the corresponding sides of two triangles are proportional, then the triangles are similar.

AA Similarity Theorem

If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

Dilation

A transformation that changes the size of a figure without changing its shape, using a scale factor.

Center of Dilation

The fixed point in a dilation where all points are either expanded or contracted from.

Scale Factor of a Dilation

The ratio of the lengths of corresponding sides in a dilation.

Similar Polygons

Polygons that have the same shape but not necessarily the same size.

Congruent Polygons

Polygons that have the same shape and size.

Proportional Parts

Corresponding sides or corresponding segments of similar figures that are in proportion.

Ratio of Areas

The ratio of the areas of two similar figures is equal to the square of the ratio of their corresponding side lengths.

Ratio of Volumes

The ratio of the volumes of two similar three-dimensional figures is equal to the cube of the ratio of their corresponding side lengths.

Geometric Mean

The positive square root of the product of two numbers.

Pythagorean Theorem

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

Triangle Inequality Theorem

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

Similarity Ratio

The ratio of the lengths of corresponding sides in similar figures.

Similarity Transformation

A transformation that produces similar figures.

Congruence Transformation

A transformation that produces congruent figures.

Angle Bisector

A line or ray that divides an angle into two congruent angles.

Perpendicular Bisector

A line, segment, or ray that is perpendicular to a segment at its midpoint.

Altitude

A perpendicular segment from a vertex of a triangle to the line containing the opposite side.

Median

A segment from a vertex of a triangle to the midpoint of the opposite side.

Centroid

The point of concurrency of the medians of a triangle.

Orthocenter

The point of concurrency of the altitudes of a triangle.

Circumcenter

The point of concurrency of the perpendicular bisectors of the sides of a triangle.

Incenter

The point of concurrency of the angle bisectors of a triangle.

Similarity Statement

A statement that indicates two figures are similar, usually written using the symbol ~.

Congruence Statement

A statement that indicates two figures are congruent, usually written using the symbol ≅.