Would be great if someone explained this

A. 2.

A radical is an expression which implies the use of a root.

There are three components of a radical expression:

(i) The root "√".

(ii) The radicand √"a".

(iii) The degree or index of the radical , when index of the radical is not shown then it understood to be a index of 2.

The index is the number used to indicate the degree of the root.

For the example , 10 is the radican and the index is not shown so it understood is 2.

hi,

you half the rectangle that you ae asking about so then you would see the scale factor of 1/2 the one u have selected, the one on top is half.

hope this !