LET’S TRY ONE
A triangle has base 8 cm and height 5 cm. What is its area?
20
½ × 8 × 5 = 20 square centimeters.
Learning steps & teaching tips
Use half the product of base and perpendicular height.
- Check that the height is perpendicular to the chosen base.
- Work through the example. Explain how its evidence supports the answer.
- Try a new question; use the explanation to check your thinking.
Try it together
Write or draw your own example with different numbers. Solve it, then ask a partner to check the method as well as the answer.
Check that the height is perpendicular to the chosen base.