# NCERT Mathematics Class 9 Exemplar Ch 12 Heron՚s Formula Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Exercise 12.1

1. An isosceles right triangle has area . The length of its hypotenuse is

(A)

(B)

(C)

(D)

2. The perimeter of an equilateral triangle is 60 m. The area is

(A)

(B)

(C)

(D)

3. The sides of a triangle are 56 cm, 60 cm and 52 cm long. Then the area of the triangle is

(A)

(B)

(C)

(D)

4. The area of an equilateral triangle with side cm is

(A)

(B)

(C)

(D)

5. The length of each side of an equilateral triangle having an area of is

(A)

(B)

(C)

(D)

6. If the area of an equilateral triangle is , then the perimeter of the triangle is

(A)

(B)

(C)

(D)

7. The sides of a triangle are , and , respectively. The length of its longest altitude

(A)

(B)

(C)

(D)