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Shapes
$200A polygon with exactly three sides.
$400This quadrilateral has four equal sides but not necessarily 90-degree angles.
$600A seven-sided polygon is known by this name.
$800This shape is defined as the set of all points in a plane that are at a fixed distance from a center point.
$1000A three-dimensional shape with six congruent square faces.
Angles
$200An angle measuring exactly 90 degrees.
$400These angles are located opposite each other when two lines intersect.
$600An angle greater than 90 but less than 180 degrees.
$800Two angles are called this if their sum is 90 degrees.
$1000The interior angles of any convex quadrilateral sum to this many degrees.
Lines & Planes
$200Lines that never intersect and are always the same distance apart.
$400Lines that cross at a 90-degree angle.
$600A line segment connecting two points on a curve.
$800This flat, two-dimensional surface extends infinitely in all directions.
$1000Lines that are not parallel and do not intersect because they exist in different dimensions.
Formulaic
$200The distance around the outside of a circle.
$400This formula relates the sides of a right triangle: a squared plus b squared equals c squared.
$600The measure of the space inside a two-dimensional figure.
$800The formula for the volume of a sphere involves this constant, approximately 3.14159.
$1000The amount of three-dimensional space an object occupies.
Famous Figures
$200Often called the Father of Geometry, he wrote The Elements.
$400This Greek mathematician calculated the value of pi using the method of exhaustion.
$600He developed the coordinate system that connects algebra and geometry.
$800He formulated the law of universal gravitation and contributed to calculus.
$1000This German mathematician proposed non-Euclidean geometry.
Terms
$200The point where two sides of a polygon meet.
$400A line segment that goes through the center of a circle and touches both sides.
$600A shape is this if it can be folded along a line so that the two halves match.
$800The ratio of a side of a triangle to its hypotenuse is defined by this branch of math.
$1000A geometric transformation that moves a figure by sliding it without rotation.