Can someone explain the answer and how the formula works?

A = 346.185 cm²

Step-by-step explanation:

The formula given is:

A = πr²

A = Area of the object (circle).

π = 3.14

r = radius, which is 1/2 of the diameter, a straight line from one end to the other.

Set the equation, plug in the corresponding numbers to the corresponding variables:

A = (3.14)(10.5)²

Simplify. Remember to follow PEMDAS.

PEMDAS =

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction

and is the order of operation.

First, solve the exponent.

(10.5)² = 10.5 * 10.5 = 110.25

Next, multiply:

A = (3.14)(110.25)

A = 346.185 cm²

A = 346.185 cm² is your answer.

~

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk