Question Paper
Class / Subject: Class 9 (CBSE) · Mathematics
Chapter: Chapter 10 — Chapter 10: Heron's Formula
Time Allowed: 15 minutes
Max Marks: 6
1. Heron's formula is used to find the: [1]
(A) area of a triangle using its sides
(B) perimeter of a triangle
(C) angles of a triangle
(D) volume of a triangle
2. The semi-perimeter of a triangle with sides 5,6,7 is: [1]
(A) 9
(B) 18
(C) 6
(D) 12
3. Heron's formula can be applied to: [1]
(A) any triangle, not just right triangles
(B) only right triangles
(C) only equilateral triangles
(D) only isosceles triangles
4. Heron's formula is especially useful when: [1]
(A) the height of the triangle is unknown
(B) all angles are known
(C) the triangle is always right-angled
(D) only the area is known
5. To find a quadrilateral's area using Heron's formula, we: [1]
(A) split it into two triangles using a diagonal
(B) use only one triangle
(C) ignore the diagonal
(D) use the perimeter only
6. Heron's formula is particularly valuable in: [1]
(A) land surveying and construction
(B) only classroom exercises
(C) only right-triangle problems
(D) calculating volumes