Lesson 19: Area of a triangle – Heron’s formula

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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.

  1. An applet.
  2. Explainer video on "Area of a triangle: Heron's formula".
  3. Exercise questions on "Area of a triangle: Heron's formula". The questions exhibit an increasing order of difficulty. 
  4. 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.