# Quadrilateral Sum Investigation

## Use the quadrilateral below to answer the questions provided.

## Add angles A, B, C, and D. What is the total sum?

## Click and drag the vertices of the quadrilateral to new locations. Add the new measures of angles A, B, C, and D. What is the new sum?

## Does the total sum of angles shown in the quadrilateral change if you change the size or shape of the figure?

## So, the interior angles of a quadrilateral always add to what value?