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Circles

100

The name of the middle of a circle

What is a midpoint

200

A part of a circle

What is an arc

Lines

100

Lines that meet at a point

what are intersecting lines

200

Lines that never meet

parallel lines

Triangles

100

Triangles where a² + b² = c²

What are right triangles

200

Triangles where all sides are equal

What is an equilateral triangle

Quadrilaterals

100

A quadrilateral with only 2 parallel sides

What is a rhombus

200

This quadrilateral has opposite sides that are equal and parallel

What is a parallelogram

Undefinables

100

an array of points that ends on one side

What is a ray

200

a flat 2-dimensional surface 

What is a plane