Geometry Lessons for Grade 5
Plot and interpret coordinate pairs, classify two-dimensional figures by a hierarchy of properties, and connect nets, prisms, and volume to three-dimensional reasoning. These lessons give each idea room for an interactive diagram, worked examples, and hands-on exploration.
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Collinear Points
Collinear points lie on the same line.
Open lesson →Coplanar Points
Coplanar points lie on the same plane.
Open lesson →Intersection
An intersection is the point or line where figures meet.
Open lesson →Convex Polygon
A convex polygon has all interior angles less than 180 degrees.
Open lesson →Concave Polygon
A concave polygon has at least one interior angle greater than 180 degrees.
Open lesson →Regular Polygon
A regular polygon has equal side lengths and equal angles.
Open lesson →Irregular Polygon
An irregular polygon does not have all sides and angles equal.
Open lesson →Heptagon
A heptagon is a polygon with seven sides.
Open lesson →Octagon
An octagon is a polygon with eight sides.
Open lesson →Nonagon
A nonagon is a polygon with nine sides.
Open lesson →Decagon
A decagon is a polygon with ten sides.
Open lesson →Dodecagon
A dodecagon is a polygon with twelve sides.
Open lesson →Semicircle
A semicircle is half of a circle and spans 180 degrees.
Open lesson →Prism
A prism is a polyhedron with two congruent parallel bases joined by rectangles or parallelograms.
Open lesson →Pyramid
A pyramid has a polygon base and triangular faces meeting at one vertex.
Open lesson →Volume
Volume measures how much three-dimensional space a solid occupies.
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