The purpose of this lesson is to explore perpendicular sides.

Included is a YouTube video to support Grade 5 Blended Learning Math - Unit 6.2: Geometry - Investigating Perpendicular Sides.

The purpose of this lesson is to explore naming angles.

Included is a YouTube video to support Grade 6 Blended Learning Math - Unit 4.1: Measurement - Angles and Polygons: Naming Angles.

The purpose of this lesson is to explore measuring angles using a protractor.

Included is a YouTube video to support Grade 6 Blended Learning Math - Unit 4.3: Measurement - Angles and Polygons: Measuring Angles.

The purpose of this lesson is to explore drawing angles.

Included is a YouTube video to support Grade 6 Blended Learning Math - Unit 4.4: Measurement - Angles and Polygons: Drawing Angles.

The purpose of this lesson is to explore naming and sorting triangles by angles.

Included is a YouTube video to support Grade 6 Blended Learning Math - Unit 6.2: Geometry - Naming and Sorting Triangles by Angles.

This task applies geometric concepts, namely properties of tangents to circles and of right triangles, in a modeling situation. The key geometric point in this task is to recognize that the line of sight from the mountain top towards the horizon is tangent to the earth. We can then use a right triangle where one leg is tangent to a circle and the other leg is the radius of the circle to investigate this situation.