### Theory

 1 Special triangles 2 Concept of right triangles 3 The Pythagorean theorem 4 Baudhayana (Pythagoras) theorem

### Exercises

 1 Calculate sum of interior angles and perimeter of equilateral triangle Difficulty: easy 3 2 Calculate the interior angle of isosceles triangle Difficulty: easy 2 3 Select the following relation which is true. Difficulty: easy 3 4 Determine the angle in isosceles triangle Difficulty: easy 3 5 Find the angle of isosceles triangle Difficulty: medium 3 6 Estimate the interior angle of a triangle Difficulty: medium 4 7 Determine the side of the right triangle Difficulty: medium 4 8 Evaluate the base of an isosceles triangle Difficulty: medium 4 9 Calculate the distance travelled Difficulty: medium 4 10 Solve the problem on isosceles triangles Difficulty: hard 5 11 Calculate the perimeter of the rectangle Difficulty: hard 5 12 Predict the width of the rectangular object Difficulty: hard 4

### Tests

 1 Training test Difficulty: medium 10

### Teacher manuals

 1 Methodical recommendation