### Theory

 1 Introduction to Heron's formula 2 Area of a triangle - Heron's formula 3 Application of Heron's formula 4 Area of an equilateral triangle

### Exercises

 1 Choose the correct answer Difficulty: easy 2 2 Find the correct answer Difficulty: easy 2 3 Find the area of an equilateral triangle Difficulty: easy 3 4 Find the area of the triangle Difficulty: medium 3 5 Calculate the area Difficulty: medium 4 6 Area of the pizza Difficulty: medium 3 7 Evaluate the area Difficulty: medium 3 8 Calculate the area of the digital board Difficulty: medium 3 9 Find the area of each colour cloth Difficulty: medium 4 10 Calculate the area of the sign board Difficulty: medium 3 11 Calculate the area of an isosceles triangle Difficulty: hard 4 12 Find the area of the quadrilateral Difficulty: hard 4 13 Calculate the area of the trapezium Difficulty: hard 4 14 Calculate the area and cost of the land Difficulty: hard 4

### Tests

 1 Training test Difficulty: medium 9 2 Training test Difficulty: medium 8

### Teacher manuals

 1 Methodical recommendation