A triangle that has two sides of equal length and congruent base angles

A triangle that has all angles less than 90 degrees

A triangle that has one obtuse angle

- An obtuse angle has a measure greater than 90 degrees

A triangle that has a right angle

- A right angle is equal to 90 degrees

A quadrilateral whose opposite sides are parallel and of equal

length

A triangle with no congruent sides and no congruent angles

A circle is the set of all points in a plane that are a distance r from a given point, called the center. 

-The distance r is the radius of the circle

A quadrilateral with four congruent sides and four right angles

A quadrilateral with only two parallel sides

A triangle with three congruent sides and three congruent angles

It is important to know these shapes and their characteristics to find information such as:

Area Perimeter Volume

These formulas will help us to find answers to real life problems in the future