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)
Answer: A
2. The perimeter of an equilateral triangle is 60 m. The area is
(A)
(B)
(C)
(D)
Answer: 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)
Answer: C
4. The area of an equilateral triangle with side cm is
(A)
(B)
(C)
(D)
Answer: A
5. The length of each side of an equilateral triangle having an area of is
(A)
(B)
(C)
(D)
Answer: D
6. If the area of an equilateral triangle is , then the perimeter of the triangle is
(A)
(B)
(C)
(D)
Answer: B
7. The sides of a triangle are , and , respectively. The length of its longest altitude
(A)
(B)
(C)
(D)
Answer: C