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Elspeth knows that pi x r = 9.42 cm. What would she need to do to find the circumference?

She could multiply 9.42 by 2.

She could multiply 9.42 by pi.

She could divide 9.42 by 2 to find the radius, then square the radius.

She could divide 9.42 by pi to find the radius, then multiply 9.42 by the radius.

Verified Answer :

Answer:

Option 1st is correct

she could multiply 9.42 by 2 to get the circumference

Step-by-step explanation:

Circumference of a circle(C) is given by:

\(C = 2 \pi r\)

where, r is the radius of the circle.

As per the statement:

Elspeth knows that \(\pi r\)= 9.42 cm

Substitute in [1] we have;

\(C = 2 \cdot 9.42\)

Therefore, she could multiply 9.42 by 2 to get the circumference

You can use the fact that the circumference of a circle is twice the radius times pi.

In order to find the circumference, Eispeth would need to do this:

Option A: She could multiply 9.42 by 2

What is the formula for finding the circumference of a circle with radius r units?

The formula for such circle's circumference is:

\(Circumference = 2 \times \pi \times r \: \rm \: units\)

Since the diameter of a circle is twice the radius, we can also write:

\(Circumference = \pi \times d \: \rm \: units\)   where d is the diameter of the considered circle.

Using above, formula, as we're already given  pi x r = 9.42 cm

The circumference = 2 x pi x r  = 2 times 9.42 cm

Thus,

In order to find the circumference, Eispeth would need to do this:

Option A: She could multiply 9.42 by 2


Learn more about circumference of circle here:

https://brainly.com/question/15211210

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