# Surf for More Math

## Lesson 4 **- Area Rule for Triangles**

To encourage your child 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.

**Goal**

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 your child 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 your
child is unsure of the answer, click the 'Give Hint' button to provide
help.

Area
of Triangles helps your child 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.