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Surf for More Math

Lesson 4 - Area Rule for Triangles

To encourage students to have fun on the Web while learning about Area Rule for Triangles, here are some games and interactive activities they can do on their own or in pairs.



Develop and use a rule for calculating the area of a triangle.


Builds Upon

Student Book pages 240-248

Instructions for Use

Triangle Explorer prompts students to investigate and calculate the area of a triangle.

To use Triangle Explorer, click the 'New Triangle' button. Determine the area of the triangle and input the answer into the text field. Click the 'Check Answers!' button to see if the answer if correct. If students are unsure of the answer, click the 'Give Hint' button to provide help.


Area of Triangles helps students find a formula for the area of a triangle.

To use Area of Triangles, drag the pink dots to change the dimensions of the triangle. Notice the changes in perimeter and area as the dimensions change.