# Trig Identity (3) - Geometric Investigation

## Drag the point on the semicircle anywhere you can. Then slide the slider slowly.

## What is the area of the shaded rectangle on the left in terms of θ?

## What is the area of the shaded rectangle on bottom right in terms of θ?

## Write an equation that describes the relationship among these 3 areas from the animation you saw above.

## New Resources

## Discover Resources

Download our apps here: