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### Theory

 1 Area of the triangle 2 Collinearity of the points

### Exercises

 1 Find the area Difficulty: easy 2 2 Find the area of the triangle Difficulty: easy 2 3 Show that the points are collinear Difficulty: easy 2 4 Find the value of 'm' Difficulty: easy 2 5 Find the value of 'k' Difficulty: medium 3 6 Check whether the points are collinear Difficulty: medium 3 7 Determine the area of the quadrilateral Difficulty: medium 3 8 Find the relation between 'a' and 'b' Difficulty: medium 3 9 Find the vertex and calculate the required area Difficulty: medium 3 10 Find the third vertex of the triangle Difficulty: hard 4 11 Find the area of the required triangle Difficulty: hard 4 12 Understand the statement and answer the questions Difficulty: hard 5 13 Find the area of the described triangle Difficulty: hard 4 14 Find the vertices and compute the area Difficulty: hard 4 15 Find the vertex of the triangle Difficulty: hard 4

### Tests

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

### Teacher manual

 1 Methodical recommendation