Two sides of a triangle are 12 cm and 15 cm. If the height of the triangle corresponding to 12 cm side is 10 cm, then the height of the triangle corresponding to 15 cm side is:

1. 4 cm

2. 12 cm

3. 8 cm

4. 16 cm

The base of a right-angled triangle is 8 cm and its hypotenuse is 10 cm. The area of the triangle is:

1. 80 cm²

2. 40 cm²

3. 48 cm²

4. 24 cm²

The altitude of an isosceles triangle is 4 cm and its base is 2 cm more than its height. The area of the triangle is :

1. 24 cm²

2. 12 cm²

3. 16 cm²

4. 8 cm²

Area of an equilateral triangle with each side 6 cm is:

1. $36\sqrt{3}$ cm²

2. $9\sqrt{3}$ cm²

3. $18\sqrt{3}$ cm²

4. $12\sqrt{3}$ cm²