The question is below

1385.622 cm^2

Step-by-step explanation:

The area of a circle is given by the formula

A = pi * r^2

We know the radius is 21 and pi is approximated by 3.142

A = 3.142 * 21^2

A = 3.142 *441

    1385.622 cm^2

So we know the area of a circle is πr^2, which means:

π * r^2.

π = pi

r = radius

So we know the values of π and r, so we can plug them in:

π * r^2

3.142 * 21^2

3.142 * 441 = 1385.622

Therefore, the area of the circle is 1385.622

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.