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**Activity #1** (30 minutes)

Warmup: Draw one triangle with an area of 12 square units. Try to draw a non-right triangle.

Explain how you know the area of your triangle is 12 square units.

1. Topic: Area of a triangle: Heron’s formula(Applet).

2. Explainer Video: Area of a triangle: Heron’s formula.

**Practice Exercise**

Topic: Area of a triangle: Heron’s formula.

**Quiz Time** – (Two sets: 30 minutes each).

Topic: Area of a triangle: Heron’s formula.

- An applet.
- Explainer video on "Area of a triangle: Heron's formula".
- Exercise questions on "Area of a triangle: Heron's formula". The questions exhibit an increasing order of difficulty.
- Two sets of quizzes on "Area of a triangle: Heron's formula". The questions exhibit an increasing order of difficulty, and an average score of 80% expected.

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