Geometry
Good Grief, Geometry!
Shapes:
- circle – has a single line to form a closed loop where all points in the line are an equal distance from the center
- triangle – has 3 sides and 3 angles to form a closed figure
- square – has 4 equal length sides and 4 90° angles to form a closed figure
- rectangle – has 2 parallel pairs of equal length sides and 4 90° angles to form a closed figure
- rhombus – has 2 parallel pairs of equal length sides and 2 sets of equal angles to form a closed figure
- trapezoid – has 1 parallel pair of equal length sides and 2 sets of equal angles to form a closed figure
- pentagon – has 5 sides and 5 angles to form a closed figure
- hexagon – has 6 sides and 6 angles to form a closed figure
- heptagon – has 7 sides and 7 angles to form a closed figure
- octagon – has 8 sides and 8 angles to form a closed figure
- nonagon – has 9 sides and 9 angles to form a closed figure
- decagon – has 10 sides and 10 angles to form a closed figure
- quadrilaterals – has 4 sides and 4 angles to form a closed figure
- parallelogram – has 2 parallel pairs of equal length sides and 2 sets of equal angles to form a closed figure
- polygons – has 3 or more sides and 3 or more angles that form a closed figure
Angles:
- acute – a 'cute little' angle that is less than 90°
- obtuse – an 'obese' angle that is more than 90°
- right – a 'just right' angle that is 90°
- straight – a 'straight across' angle that is 180°
Triangles:
- acute – a triangle where all 3 angles are acute or less than 90°
- equilateral – a triangle where all 3 angles are equal
- isosceles – a triangle where 2 angles are equal
- obtuse – a triangle where 1 angle is more than 90°
- right – a triangle where 1 angle is 90°
- scalene – a triangle where none of the angles are equal
Points and Lines:
- line – two ended arrow that goes on forever in both directions
- line segments – the inside section of a line
- intersecting line – two lines that cross over each other
- parallel lines – two line segments that run side by side like railway tracks
- perpendicular lines – intersecting lines that form a cross, they create a 90° angle
- points – are like a dot on a piece of paper that identifies an exact location
- rays – an arrow that goes on forever in one direction
Growing Fond of Geometry
Teaching Resources for Math for Geometry
Geometry Worksheets
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Gaining on Geometry
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