Question

Find the area of circle with question number 4 diameter = 42 CM​

Answer 1

Answer:

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Step-by-step explanation:

The area of the circle whose diameter is 42 cm is 1,386 cm².

Step-by-step explanation:

To find the area of a circle, we would use the equation \pi r^2πr

2

.

In this case we have the diameter, and that's 42 cm.

The radius of a circle is half of the diameter, therefore the radius would be 21 cm.

Now we know the radius,we can plug that in to our equation.

Your equation should look like this:

\pi(21~\text{cm})^2π(21 cm)

2

We know that pi is a constant, and the value of pi is \bold{\dfrac{22}{7}}

7

22

.

Now, you can solve.

\dfrac{22}{7}\times(21~\text{cm})^2

7

22

×(21 cm)

2

=\dfrac{22}{7}\times441~\text{cm}^2=

7

22

×441 cm

2

Simplify;

1386~\text{cm}^21386 cm

2

When you are done solving, you'll get 1386 cm²

1386 cm² will be your FINAL answer.

Answer 2

Answer:

441 pi or 1385.44 (2.d.p)

Step-by-step explanation:

radius = 21 because radius is 1/2 of the diameter and 42/2 = 21

area of a circle is pi x radius squared

area = pi x 21 squared

area = 441 pi

area = 1385.44 (2.d.p)