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  • Class 9 Maths Study Material

An Educational platform for Preparation and Practice Class 9. Kidsfront provide unique pattern of learning Maths with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Maths for Class 9. This study material help Class 9, Maths students in learning every aspect of Heron s formula. Students can understand Heron s formula concept easily and consolidate their learning by doing Online Practice Tests on Maths,Heron s formula chapter repeatedly till they excel in Class 9, Heron s formula. Free ONLINE PRACTICE TESTS on Class 9, Heron s formula comprise of Hundreds of Questions on Heron s formula, prepared by the highly professionals team. Every repeat test of Heron s formula will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Heron s formula. Attempt ONLINE TEST on Class 9,Maths,Heron s formula in Academics section after completing this Heron s formula Question Answer Exercise.

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Heron s formula
Two sides of a triangle are of lengths 5cm and 12cm. If the perimeter of the triangle is 30cm,then its area is

a) 45cm2
b) S
c)         60cm2
d)         90cm2

Correct Answer Is : 45cm2
Solution Is :
Area of a triangle of sides a,b and c and semi-perimeter s is

a) S(s-a)(s-b)(s-c)
b)         (1/2)s(s-a)(s-b)(s-c)
c) √s(s-a)(s-b)(s-c)
d) 1/2√s(s-a)(s-b)(s-c)

Correct Answer Is :         (1/2)s(s-a)(s-b)(s-c)
Solution Is :
Area of an equilateral triangle with perimeter 60 is

a) 50√3
b) 75√3
c) 200√3
d) 100√3

Correct Answer Is : 200√3
Solution Is :
An isosceles triangle has a non-equal side of 12 cm and one of the equal sides is 8 cm, then the area of this triangle is


Correct Answer Is :
Solution Is :
In adjoining figure, the ratio of sides QS:SR is 5:3. If the area of triangle PQR Is 56cm2 then area of triangle PSR is

a) 16cm2
b)         21cm2
c)         30cm2
d)         45cm2

Correct Answer Is : 16cm2
Solution Is :
The base of an isosceles right triangle is 20 cm. Its area is

a) 450cm2
b)         250cm2
c)         200cm2
d) 250√3cm2

Correct Answer Is :         250cm2
Solution Is :
The base and hypotenuse of a right triangle are respectively 5cm and 13cm long. Area of the triangle equals to

a) 60cm2
b)         25cm2
c)         45cm2
d)         30cm2

Correct Answer Is :         45cm2
Solution Is :
In Heron`s formula semi perimeter s is equal to ? 

a) (a+b+c)/3 
b)      (a+b+c)/2 
c)      (a+b+c)/4 
d)      (a+b+c) 

Correct Answer Is : (a+b+c)/3 
Solution Is :
Two sides of a triangle are 12cm and 14cm and its perimeter is 43cm.The third side is :? 

a)     20 
b)     21 
c)    17
d)     23 

Correct Answer Is :     21 
Solution Is :
The length of each side of an equilateral triangle of area 9 3cm2 is equal to

a)     9 cm
b)     6 cm 
c)    3 cm
d)     6 3 

Correct Answer Is :     9 cm
Solution Is :
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