# Primary Catalogue

## Series: Understanding Elementary Shapes

### Angles: Acute, Obtuse and Reflex

This video defines and helps students identify acute, obtuse and reflex angles.

### Area of a Rectangle

This video explores how to calculate the area of a rectangle. Students will learn what area is and different strategies to measure the area of a rectangle including counting squares and multiplying its dimensions.

### Measuring Angles

This video explains how to measure angles of different degrees.

### Perimeter

This video explores what perimeter is and how to calculate it.

### Perimeter of Regular Shapes

This video explores measuring the perimeter of regular shapes. Students will earn about what regular shapes are, and the various strategies that can be used to measure their perimeters.

### Polygons

This video describes and explains how to classify polygons.

### Three Dimensional Shapes

This video explains the distinct features of three-dimensional shapes such as faces, edges and vertices.