Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a circle tangent to the line x+y=5. Source: Linnea Reyes-LaMon

Read More »# Congruence

## Geometric Proofs

Directions: Using exactly five geometric markings to show that a quadrilateral is a square. Source: Robert Kaplinsky

Read More »## Supplementary Angles

Directions: Using the digits from 0 – 9, at most one time each, find the measures of the two angles forming supplementary angles as close as possible in size. Source: Debra Schneider

Read More »## Transformations

Directions: Given triangle ABC with vertices (-8,2), (-2,2), and (-2, 8), create triangle DEF in quadrant one that uses a translation, rotation, and reflection (in any order) to take that triangle to triangle ABC and show congruence. Source: Jon Henderson

Read More »## Line of Reflections on Isosceles Triangles

Directions: How many ways can you determine the location of the line of reflection for isosceles triangle XYZ that maps Point X to Point Z? Source: Irvine Math Project, Nanette Johnson, and Robert Kaplinsky.

Read More »## Create Squares

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to create a square with one of the vertices at (2,3). Source: John Mahlstedt

Read More »## Transformations – Shortest Sequence

Directions: What is the fewest number of transformations needed to take pre-image ABCD to image A’B’C’D’? Source: Robert Kaplinsky

Read More »## Transformations – Three Sequences

Directions: List three sequences of transformations that take pre-image ABCD to image A’B’C’D’. Source: Robert Kaplinsky

Read More »## How Many Squares?

Directions: How many squares are shown in the diagram below? Source: This problem was found in the Fifth Edition Elementary Geometry for College Students by Alexander and Koeberlein

Read More »## Is the Quadrilateral a Kite?

Directions: What is the least number of geometric markings to show that a quadrilateral is a kite? Source: Nanette Johnson

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