I might have used a long method to answer the question, but here's how I solved it:-

Area of Semi-circle = Area of Entire Circle / 2

Area of Entire Circle = πr^2 --> π*(π/2)^2 --> π*(π^2/4) --> π^3/4

Area of Semi-circle = π^3/4 / 2 --> π^3/4*2 --> π^3/8

Area of Inscribed Circle = πr^2 --> π*(π/4)^2 --> π*(π^2/16) --> π^3/16

Area not covered by the Inscribed Circle

= Area of Semi-circle - Area of Inscribed Circle

= π^3/8 - π^3/16

= π^3/16

Finally :

Area of Semi-circle / Area not covered by the Inscribed Circle

= π^3/8 / π^3/16

= π^3/8 * 16/π^3

= 2:1

I have laid down each step in detail as I am new with typing math in text so tried my best not to good up

I hope this is also a right way to solve the problem.

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“Today I will do what others won't, so tomorrow I can accomplish what others can't”

Jerry Rice