Shapes
A shape with 4 equal sides and 4 right angles
Square
Any closed plane with at least 3 straight sides and angles
Polygon
Two lines that never cross are....
Parallel
A 10-sided polygon
Decagon
A shape with 3 straight sides and 3 angles
triangle
A 5-sided polygon
Pentagon
Two lines that intersect and make a right (90 degree) angle are...
Perpendicular
A round plane whose boundary consists of all points equidistant from its center
Circle
A quadrilateral with two sets of parallel sides
Parallelogram
A 6-sided polygon
Hexagon
A 9-sided polygon
Nonagon
A oval shape (like a smushed circle)
Ellipse
A quadrilateral with 4 right angles
Rectangle
An 8-sided polygon
Octagon
A polygon where all sides and angles are equal
Regular Polygon
Formula for area of a parallelogram
A = base * height
A quadrilateral with only 1 pair of parallel sides
Trapezoid
A 7-sided polygon
Heptagon
A 12-sided polygon
Dodecagon
Formula for area of a circle
BONUS 600: Formula for area of ellipse?
Circle A = Pi * radius2
Ellipse A = Pi * aaxis * baxis