This lesson presents the idea that the area of any triangle is exactly half of a certain parallelogram -- thus we get the familiar formula of multiplying the base and the altitude and taking half of that. The lesson contains varied...

Use this interactive tool to learn how to find the area of a parallelogram. Click on "Instructions" for details on how to use this tool. Click on "Explore" for more ideas.

Demonstrates how to calculate the area of two-dimensional shapes using formulas. Covers parallelogram, triangle, trapezoid, and circle. Includes a video modeling how to find the area of a circle and a triangle. [0:59]

In this set of worksheet activities, students will be guided to discover formulas for area of polygonal shapes and circles.

Brush up on your math skills pertaining to parallelograms then try some practice problems to test your understanding.

Students are taught how to calculate the perimeter of a parallelogram. Extra practice drill problems are also included.

This tool allows you to create worksheets of word problems at varying levels of difficulty where students must calculate the area or perimeter of different polygon shapes. You can choose to set up the page using any of these polygon...

Learn about the properties of 2-D shapes: circles, triangles, polygons, and quadrilaterals. Includes information, video, and examples about each, with games and quizzes for reinforcement.

Brush up on your math skills relating to trapezoids then try some practice problems to test your understanding.

Brush up on your math skills relating to rectangles then try some practice problems to test your understanding.

Brush up on your math skills relating to rhombuses then try some practice problems to test your understanding.