Important Questions for Class 9 Maths Ch-10

Important Questions for Class 9 Maths Ch-10 Heron’s Formula

Practice Exercise 10.1

Question 1:
The semi-perimeter of an equilateral triangle with side ‘2a’ units is:
भुजा ‘2a’ इकाई वाले एक समबाहु त्रिभुज का अर्धपरिमाप है:
(a) 6a (b) a (c) 2a (d) 3a

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Question 2:
The Perimeter of a triangle is 50 cm. The length of one side of the triangle in 4 cm longer than the smaller side, and the third side is 6 cm less than twice the smaller side. Find the area of a triangle.

Question 3:
A triangle ABC has sides 20 cm, 20 cm and 10 cm and triangle DEF has sides 30 cm, 60 cm and 60 cm. Find the ratio of area of triangle ABC to that of triangle DEF.
एक त्रिभुज ABC की भुजाएँ 20 सेमी, 20 सेमी and 10 सेमी है तथा त्रिभुज DEF की भुजाएँ 30 सेमी, 60 सेमी and 60 सेमी. त्रिभुज ABC के क्षेत्रफल का त्रिभुज DEF के क्षेत्रफल से अनुपात ज्ञात कीजिए।