Science

 Here are 10 questions related to Heron's Formula for Class 9:

1. **Find the area of a triangle with sides 7 cm, 8 cm, and 9 cm using Heron's formula.**

2. **A triangle has sides of length 13 cm, 14 cm, and 15 cm. Calculate its area using Heron's formula.**

3. **Calculate the area of an isosceles triangle with sides 10 cm, 10 cm, and 12 cm using Heron's formula.**

4. **The sides of a triangle are 9 cm, 12 cm, and 15 cm. Use Heron's formula to find the area.**

5. **Find the area of a right-angled triangle with sides 5 cm, 12 cm, and 13 cm using Heron's formula.**

6. **A triangle has sides measuring 6 cm, 8 cm, and 10 cm. Find its area using Heron's formula.**

7. **Calculate the area of a triangle with sides 15 cm, 20 cm, and 25 cm using Heron's formula.**

8. **Find the area of a triangle with sides 21 cm, 20 cm, and 13 cm using Heron's formula.**

9. **A triangle has sides of lengths 11 cm, 13 cm, and 16 cm. Use Heron's formula to find its area.**

10. **The sides of a triangle are 24 cm, 18 cm, and 30 cm. Calculate the area using Heron's formula.**

These questions require students to apply Heron's formula, which is a key part of the Class 9 curriculum for calculating the area of a triangle when the lengths of all three sides are known.