Convexo

The video tutorial covers two main topics: the perimeter of a circle and the historical uses of convex lenses. It begins with a discussion on calculating the perimeter of a circle, followed by an exploration of how convex lenses have been utilized for vision correction, magnification, and fire-making over the past 3000 years.

What is the perimeter of a circle commonly referred to as?

• Diameter

• Circumference

• Radius

• Area

For how long have convex lenses been used to correct vision?

• 1000 years

• 500 years

• 3000 years

• 2000 years

Which of the following is NOT a use of convex lenses?

• Creating fire

• Cooling objects

• Magnifying objects

• Correcting vision

What is one of the historical uses of convex lenses?

• To freeze water

• To build structures

• To make fire

• To create electricity

How many years have convex lenses been used for making fire?

• 1000 years

• 2000 years

• 4000 years

• 3000 years