High School: Geometry

Directions: Using the digits 0 to 9 at most one time each, create two similar triangles. You may have as many leading zeros as you like. Source: Drew Ross

Directions: Using the values 8, 10, 12, 14, 16, 18, and 20, determine lengths for an acute triangle, a right triangle, an obtuse triangle, and a non-triangle. Source: Jonathan Lees

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a true statement Source: Dwight Stephenson

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to list the dimensions of a rectangular prism and rectangular pyramid so that both shapes have equal volumes. NOTE: Images are not drawn to scale. Source: Aaron Arispe

Directions: Using the digits 0 to 9 at most one time each and as many leading zeros as you like, place a digit in each box to create two similar triangles. Source: Drew Ross

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a right triangle where 𝜃 is as close to 10° as possible. Source: Thomas Derstein

Directions: Using the integers -9 to 9 at most one time fill in the boxes to create a right triangle on the coordinate plane. Source: Tracy Conte

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

Directions: Using the integers -9 to 9, at most one time each, fill in the boxes to create a circle and a point on the circle. Source: Robert Kaplinsky

Directions: Using the integers -9 to 9, at most one time each, fill in the boxes to create a circle and a point on the circle with the point being as close to the origin as possible. Source: Robert Kaplinsky