[Free Registration/Login may be required to access all resource tools.] This study guide reviews the formulas for area and perimeter of triangles and different kinds of quadrilaterals.

Explore finding and measuring perimeter of figures.

Make the following triangles on a geoboard. Remember that the pegs are equally spaced in a square grid. Compare the areas of the triangles. Aligns with 6.G.A.1.

[Free Registration/Login may be required to access all resource tools.] This study guide looks at the definitions and units for perimeter, area, and circumference, and at the perimeter and area of different shapes, including regular...

Learn how to find the areas and perimeters of triangles and special quadrilaterals.

Use this calculator to find the sides, perimeter, area, semiperimeter, and altitude of an isosceles triangle.

This CoolMath resource provides an introduction to some Precalculus formulas.