Use a straightedge to draw a triangle on your paper.
Estimate the measure of each angle in your triangle and label it.
An acute angle measures less than
. A right angle measures . An angle measuring more than but less than is obtuse.
Add your three estimated angle measures. What do you notice? Do you need to change any of your estimates?
The measures of the three angles of a triangle should add up to
. Do your angle estimates follow this rule?