The perimeter of a rectangle whose length is 6 metre more than its breadth is 84 metre. What is the area of the triangle whose base is equal to the diagonal of the rectangle and height is equal to the length of the rectangle?

Correct Answer: Rs. 3900

Explanation:

Area = (l + b ? d) d

= (80 + 60 ? 10)10

=> 1300 sq.mts

=> 1300 x 3 = Rs.3900

Correct Answer: 115.395 sq cm

Explanation:

Because each vertice of the square is the center of a circle
(1/4) part of the total area of each circle inside of the square.
(3/4) part of the total area of each circle outside of the square.
Thus total area outside the square is 4 3 4 × 22 7 × 3 . 5 × 3 . 5 = 115.3955 sq cm.

Correct Answer: 84m

Explanation:

let inner radius be r meters. 

$$\begin{gathered} 2 ?r = 440 ? r = 440 × 7 44 = 70 m \\ radius of outer circle = 70 + 14 m \end{gathered}$$  

 

Therefore, Radius of outer circle = 70 + 14 = 84m

Correct Answer: 18

Explanation:

a =  1 2 × 15 × 12 = 90 sq.cm  

b = 2a =  1 2 × 20 × h  

h= 18cm

Correct Answer: 31.68kmph

Explanation:

In this type of question, we will first calculate the distance covered in given time.

 

Distance covered will be : Number of revolutions x Circumference 

 

So we will be having distance and time, from which we can calculate the speed. 

 

Radius of wheel = 70 / 2 = 35 cm

 

Distance covered in 40 revolutions will be  40 * c i r c u m f e r e n e = 40 * 2 ?r = 40 * 2 * 22 7 * 35 = 8800 cm = 88 m

 

Distance covered in 1 sec  =  88 10 = 8 . 8 m / s = 8 . 8 * 18 5 k m / h r = 31 . 68 k m / h r

 

 

 

 

 

 

 

 

Correct Answer: 1232

Correct Answer: 36m

Explanation:

Let the length of the rectangle be 3x and breadth be 1x
Given, perimeter = 96 m
2(l + b) = 96 (or) l + b = 48 (or) 3x + 1x = 48 (or) x = 12 m
Now, Length of the rectangle = 12 x 3 = 36 m

Correct Answer: ?265 cm

Explanation:

Correct Answer: 240

Correct Answer: 84