Question

Please help! Precalco

Answer 1

Answer:

  A = 2r²

Step-by-step explanation:

A square is a rhombus with equal-length diagonals. A square inscribed in a circle has diagonals equal to the diameter of the circle: 2r.

The area of a rhombus is half the product of the lengths of its diagonals. Hence the area of our square is ...

  A = (1/2)(2r)(2r)

  A = 2r²

Answer 2

Answer:

2

Step-by-step explanation:

r=1/2s$\sqrt{2}$

2r=s$\sqrt{2}$

2r/$\sqrt{2}$=s remove $\sqrt{2}$ denominator by multiplying with $\sqrt{2}$/$\sqrt{2}$

2$\sqrt{2}$r/2  -- simplify , 2 cancels

s=r$\sqrt{2}$

so area = (r$\sqrt{2}$)^2

A(r)= 2r²