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Prerequisites

- A knowledge of the four operations from lessons N2a, N2b, N2c, N2d, N2e and N2f is assumed
- G16a – Area of a rectangle
- G16b – Area of a parallelogram

# Area of a triangle

Teacher resources

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- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)

- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)

- Skills drill worksheet (15 questions on one side of A4; answers included)

Link to an interesting problem

Links to past exam and UKMT questions

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#### Interactive GeoGebra activity: Create a triangle with a given area

#### Interactive GeoGebra activity: Find the area of a triangle given the coordinates of its vertices

In this activity, at least one side of the triangle will be parallel to one of the axes.

In the real world

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What next?

- G16d – Area of trapezia
- G17a – Perimeter of polygons
- G20a – Pythagoras’ theorem
- Pythagoras and surds assorted problems – requiring knowledge of G20a, N8b, G17a, and G16c