Geometry
Word Language Number
tri Greek 3
quad Latin 4
tetra Greek 4
penta Greek 5
hexa Greek 6
hepta Greek 7
septa Latin 7
octa Greek/Latin 8
nona Greek 9
deca Greek 10
hendeca Greek 11
dodeca Greek 12
icosa Greek 20
Math Vocabulary:
A point names a location in space.
A line extends without end in opposite directions. (aka true line)
"Segment" means part. A line segment is part of a line. It is named by its two endpoints.
A ray has one endpoint and extends without end in one direction. A ray is named using two points. The endpoint is always named first. Two rays or line segments that share an endpoint form an angle. The shared point is the vertex of the angle.
A right angle forms a square corner. (90 degrees)
An acute angle opens less than a right angle. (less than 90 degrees)
An obtuse angle opens more than a right angle and less than a straight angle. (more than 90 degrees, but less than 180 degrees)
A straight angle forms a line. (exactly 180 degrees)
Parallel Lines Perpendicular Lines:
Classify Triangles:
A triangle has three sides and 3 angles. Each pair of sides joins at a vertex. You can name a triangle by its vertices.
Classify Quadrilaterals:
A quadrilateral is a polygon with four sides and four angles. Some quadrilaterals have special names.
Trapezoid has exactly one pair of parallel sides. Kites have zero parallel sides. Parallelograms have two pairs of parallel sides.
Line Symmetry:
???Can you match up the correct nets shown below???
