Directions: What is the side length of an equilateral triangle that has an area of 5 square units? Source: Robert Kaplinsky

Read More »# High School: Geometry

## 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 »## Equidistant Points

Directions: How many points with two integer coordinates are 5 units away from (-2, 3)? Source: Dylan Kane

Read More »## Cone and Cylinder Volumes

Directions: A cone is twice as tall as a cylinder of the same radius. What is the ratio of their volumes? Source: Dylan Kane

Read More »## Equation of the Biggest Circle

Directions: Using any integers, fill in the blanks to Fill in the blanks with integers so that: The equation’s graph is a circle. The circle has the biggest area The circle is completely inside the first quadrant The circle’s radius is a whole number 1 through 9. Source: Nanette Johnson

Read More »## Longest Chord in a Circle

Directions: What is the longest chord in a circle that has an area of 25π square units? Source: Nanette Johnson

Read More »## Make the Biggest Circle

Directions: Using the digits 1 to 9 as many times as you want, fill in the boxes to make the biggest circle: Source: Robert Kaplinsky

Read More »## Which Circle Is Bigger? (High School)

Directions: Which circle is bigger? Circle A with an area of 25 square units or Circle B with the equation x^2 + y^2 = 25 Source: Robert Kaplinsky

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

Read More »## Is the Quadrilateral a Square?

Directions: What is the least number of geometric markings needed to demonstrate that a quadrilateral is a square? Source: A collaborative effort of Jose De La Torre and Nanette Johnson answer by Ricardo Navarro with help from Robert Kaplinsky

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