Geometry for Primary Grades

Geometry for Primary Grades

by Ronnie Lorilla

​Simple Geometric Figures

• ​Point is a location in a space. It has no length, width and height.

• ​A line is a continuous collection of points. It has no endpoint. It has a length but no width and height. It can be named by two capital letters or one small letter in a script.

• ​Line segment is a part pf a line. It is a finite set of points on a straight path. It has two endpoints. It can be named by capital letters.

• ​Ray is also a part of a line. It has one endpoint and it can be extndd in one direction only.

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​Two-Dimensional Objects

​This is a triangle.

​It has three sides.

​This is a rectangle.

​It has two opposite sides of equal lengths.

​It has four right angles.

​Two-Dimensional Objects

​This is a square.

​It has four equal sides.

​It has four right angles.

​This is a pentagon.

​It has five sides.

​Two-Dimensional Objects

​Circle

​Quarter circle.

​Half-circle

​Three-Dimensional Objects

​Pyramid is a three-dimensional object. It has length, width and height. It is made up of a rectangular base and triangular faces.

​The three-dimesional objects are also called as solid figures or simply solids.

​Common three-dimensional objects.

• ​Rectangular Prism

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• ​It has 6 rectangular faces, 8 corners or vertices and 12 edges

​Common three-dimensional objects.

• Cylinder

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• ​It has 2 circular faces, 2 curves edges, and a curved surface, but has no corner.

​Common three-dimensional objects.

• Cone

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• ​It has one corcular face, a curved surface, one corner and one curved edge.

​Common three-dimensional objects.

• ​Cube

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• ​It has 6 square faces, 8 corners or vertices and 12 edges.

Multiple Choice

What is this?

• Cone

• Circle

• Cylinder

• Sphere

​Common three-dimensional objects.

• Sphere

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• ​It has curved surface but has no edge and corner

Multiple Choice

What is this?

• Cube

• Rectangular prism

• Pyramid

• Rectangle

Multiple Choice

What is this?

• Rectangular prism

• Cylinder

• Pyramid

• Cube

Multiple Choice

What is this?

• Sphere

• Cylinder

• Globe

• Circle

Multiple Choice

What is this?

• Triangle

• Cone

• Pyramid

• Cylinder

​Symmetry

​Symmetry means that a figure forms two equal parts or mirror image of the other when folded. The line that divides the figure into two equal parts is called line of symmetry.

​Tessellation

​Tessellation is a pattern of shapes that perfectly fit together.

Multiple Select

What shapes are repeated?

• Square

• hexagon

• triangle

• circle

Multiple Choice

What shape is repeated?

• rectangle

• triangle

• square

• circle

Multiple Select

What shapes are repeated?

• square

• triangle

• hexagon

• circle

Multiple Select

What shapes are repeated?

• rectangle

• square

• triangle

• hexagon