In △ABC, ∠B is a right angle. If D is the foot of the perpendicular drawn from B on AC, then:

1. BC² + CD² = AC²

2. AB² - BC² = AD² - CD²

3. BC² - BD² = AB² - AD²

4. None of these.

In the adjoining figure, CD =

1. 36 cm

2. 40 cm

3. 41 cm

4. None of these

The lengths of the diagonals of a rhombus are 5 cm and 12 cm. The length of each side of the rhombus is:

1. 13 cm

2. 6.5 cm

3. 6.25 cm

4. 5.25 cm

The diagonals AC and BD of a rhombus ABCD are of lengths 6 cm and 8 cm. The length of each side of the rhombus is :

1. 3 cm

2. 5 cm

3. 7 cm

4. 9 cm