Definition: The measure of an angle with a measure between 0° and 90° or with less than 90° radians.
Also Known As:
A positive angle that measures less than 90°
Calculating area is a pre-algebra skill that should be well understood prior to beginning algebra. Also includes an online area calculator for the most common shapes.
Need a graphing calculator? Some of the best prices can be found here.
A review of polygons.
Elsewhere on the Web:
Here you'll find several triangles and their names.