What is the radius of a circle circumscribed about a rectangle with a length of 8 centimeters and a width of 6 centimeters?

If we think about it, the touching parts of the rectangle and circle are the corners

the distance between opposite corners is the diameter of the circle
the radius would be 1/2 diameter
so we just use the pythagorean theorem to find the legnth of the diagonal and thus the diameter then halve that to get radtius

a^2+b^2=c^2
c=hypotonuse
a and b are legs

8^2+6^2=c^2
64+36=c^2
100=c^2
10=c

10=diameter
10/2=5=radis

5 centimeters

C. i believe it is (5×(-20))+(100×(0.7))

What can we do about it