Polygons
A regular, three-sided polygon
What is an equilateral triangle?
A circle that touches each vertex of a rectilineal figure
What is circumscribed?
He wrote the Timaeus.
Who is Plato?
What is (A solid is) that which has length, breadth, and depth?
What is a segment?
A polygon with five sides
What is a pentagon?
An enclosed, rectilinear figure with three or more sides
What is a polygon?
This theorem, proven by Euclid, describes the relationship between the sides of a right triangle.
Who is Pythagoras?
What is "a surface"
A straight line that touches (but does not cut) a circle
What is a tangent?
The sum of all the angles in a polygon
What is
180 xx (n-2)
A circle that touches each side of a rectilinear figure exactly once
What is inscribed?
His theorem states that any angle that subtends a diameter is a right angle.
Who is Thales?
The intersection of a two planes
What is a line?
A part of a circle that is contained by a central angle and the arc it stands upon
What is a sector?
A polygon with six sides
What is a hexagon?
The relationship of the base angles of an isosceles triangle to the remaining angle that is needed to construct a regular pentagon
What is 2-to-1?
Some people think he wrote a textbook to help understand Plato's view of the universe.
Who is Euclid?
What are solid, polyhedron, and regular polyhedron?
The relationship between a circle's circumference divided by its diameter
What is Pi?
The perpendicular distance from the center of a regular polygon to its side
What is an apothem?
The line that contains three of four triangle centers for most triangles
What is Euler's line?
The author of a commentary on Euclid's Elements who gave us the formula for the sum of the angles in a regular polygon.
Who is Proclus
What are a tetrahedron, a cube, an octahedron, a dodecahedron, and an icosahedron
A straight line perpendicular to another line that lies tangent to a circle will go through this
What is the center of the circle?