Geometry I
Triangles and Hexagons
The figure below is a regular hexagon dissected into a triangle, a rhombus, and a trapezoid.
If the area of the blue triangle is what is the area of the red trapezoid?
Triangles and Hexagons
Which has a greater area: an equilateral matchstick triangle made out of 12 matchsticks, or a regular hexagon with the same perimeter?
Triangles and Hexagons
Try this riddle:
I am a peculiar quadrilateral. If you put 3 copies of me together, I can form an equilateral triangle. Similarly, if you put 3 copies of an equilateral triangle together, then they can form me!
What quadrilateral am I?
Definitions:
- parallelogram
- trapezoid
- rhombus
Triangles and Hexagons
A dissection of a polygon is a pattern for cutting one polygon up into many polygonal pieces. The hexagon dissection below uses a combination of all of the pieces in the six-pointed star and all of the pieces in the dissection of the triangle with a small hole in the center.
If the star has an area of 20, what is the area of the hexagon?
Triangles and Hexagons
An equilateral triangle is inscribed in a regular hexagon so that its vertices lie on three vertices of the hexagon, as shown below. Which is greater, the area of the red section or the area of the blue?
Triangles and Hexagons
An equilateral triangle is inscribed in a regular hexagon so that its vertices lie on the midpoints of 3 of the hexagon's sides, as shown below. Which is greater, the area of the red section or the area of the blue?
