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Asked/Added Questions From NCERT:


Answer:

Himanshi Verma

 Given

Ratio of side =3:2

Perimeter =60cm

Altitude =5cm


So let take one side as 3x and other is 2x


Then perimeter of parallelogram 

=3x+2x+3x+2x

=10x 


According to question perimeter =60cm 


Then 

10x=60cm 

X=60/10=6cm


Then one side is =6 x 3=18


And other is =2x6=12


So base=18cm 


Area of parallelogram =bxh


=18x5=90cm²


Altitude corresponding to smaller side 


90=12xh


H=7.5cm 

-Answered by Himanshi Verma On 05 February 2019:05:26:39 PM


Question 2. Asked on :28 January 2019:10:53:52 AM

 A garden is 90 m long and 75 m broad. A path 5 m wide is  to be built outside and around it. find the area of the garden in hectare. 

-Added by praful kumar Mathematics » Perimeter And Area

Answer:

Himanshi Verma

 Length (l) of garden = 90 m


Breadth (b) of garden = 75 m


Area of garden = l × b = 90 × 75 = 6750 m2


From the figure, it can be observed that the new length and breadth of the garden, when path is also included, are 100m and 85m respectively.


Area of the garden including the path = 100 × 85 = 8500 m2


Area of path = Area of the garden including the path − Area of garden


= 8500 − 6750 = 1750 m2


1 hectare = 10000 m2


Therefore, area of garden in hectare


=6750/10000


=0.675

-Answered by Himanshi Verma On 02 February 2019:01:49:33 PM


Question 3. Asked on :28 January 2019:10:49:14 AM

 Find the area of a square park whose perimeter is 320m. 

-Added by praful kumar Mathematics » Perimeter And Area

Answer:

Himanshi Verma

 A=6400m2

-Answered by Himanshi Verma On 03 February 2019:04:19:42 PM


Answer:

Master Purushottam

  Let ABCD, the square garden of side= 30 m.

PQRS is the region inside the garden.

so,

PQ = (30 -1-1 ) = 28 m

also

PS = ( 30 – 1 – 1 ) = 28 m 


(i) Area of the path = Area of ABCD – Area of PQRS 

= [( 30 x 30) – (28 x 28)]

= 900 – 784 

= 116 sq.m 


(ii) Area of the remaining portion in which the grass is planted = Area of square PQRS 

= 28 x 28 

= 784 sq.m 


cost of planting the grass in the region PQRS =  area x cost = 764 x 40

 =31,360

-Answered by Master Purushottam On 24 August 2019:12:14:42 AM


 

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