Question

37. Select the option in which the numbers
share the same relationship as that
shared by the given number-pair.
8:49
(a) 9:87
(b) 15: 210
(c) 13:170
(d) 12 : 121​

Answer 1

Answer:

Given, Length (PQ)= 10cm

Given, Breadth (QR) = 7cm  

Area of Rectangle PQRS will be = 10 * 7

                                         

                                                    = 70cm^2

Given that two semicircles of Diameter QR and PS are cut off, then

Area of remaining part will be Area of the rectangle - Area of the semicircle

Area of semicircle =  pi * r * r/2

                              = (22/7 * 3.5 *3.5 )/2

 

                              = 38.5/2

                             = 19.25cm^2

Area of two semicircles = 19.25 + 19.25

 

                                       = 38.50cm^2

Area of remaining portion = 70 - 38.50

 

                                           = 31.50cm^2.

Hope this helps!

Step-by-step explanation: