Answer: d1 is 50, c2 is 21/25
72.25 - 51.5= <span>20.75
it is 20.75 feet longer</span>
Given that,
Radius of the circle, r = 8.91 cm
Angle, 
To find,
The area of minor sector.
Solution,
The formula for the area of minor sector is given by the formula as follows :

So, the area of the shaded sector is
.
70/9
7 is equivalent 63/9, and then you add 63 and 7 to get 70/9
take father's age as x
if it is doubled i.e 2x .we get the answer as 20 less than 100 which means 100-20=80
accordingly the equation will be 2x=80
x=40
given that ,
son is 1/4 th of his father
hence ,
son = 1/4×(x)
I.e, 1/4×40 =10
Hope it helps