Question

Solve the missing elements for each problem. Use 3.14 for Pi

Answer 1

Answer:

Radius is half of diameter, so just divide those by 2. And to find diameter, multiply by 2.  Use the radius to find the circumference and the area.

Circumference=2πr Area=πr2

Step-by-step explanation:

Answer 2

The radius of a circle is half the diameter of the same circle.

Circle 1

The diameter is 38 inches.

This means that the radius is 19 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 19$

$C = 119.32$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 19^2$

$A= 1133.54$

Hence, the missing elements are:

Radius = 19 inches, Circumference = 119.32 inches and Area = 1133.54 square inches

Circle 2

The diameter is 32 inches.

This means that the radius is 16 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 16$

$C = 100.48$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 16^2$

$A= 803.84$

Hence, the missing elements are:

Radius = 16 inches, Circumference = 100.48 inches and Area = 803.84 square inches

Circle 3

The radius is 15 inches.

This means that the diameter is 30 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 15$

$C = 94.2$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 15^2$

$A= 706.5$

Hence, the missing elements are:

Diameter = 30 inches, Circumference = 94.2 inches and Area = 706.5 square inches

Circle 4

The diameter is 8 inches.

This means that the radius is 4 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 4$

$C = 25.12$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 4^2$

$A= 50.24$

Hence, the missing elements are:

Radius = 4 inches, Circumference = 25.12 inches and Area = 50.24 square inches

Circle 5

The radius is 18 inches.

This means that the diameter is 36 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 18$

$C = 113.04$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 18^2$

$A= 1017.36$

Hence, the missing elements are:

Diameter = 36 inches, Circumference = 113.04 inches and Area = 706.5 square inches

Circle 6

The diameter is 16 inches.

This means that the radius is 8 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 8$

$C = 50.24$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 8^2$

$A= 200.96$

Hence, the missing elements are:

Radius = 8 inches, Circumference = 50.24 inches and Area = 200.96 square inches

Circle 7

The diameter is 12 inches.

This means that the radius is 6 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 6$

$C = 37.68$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 6^2$

$A= 113.04$

Hence, the missing elements are:

Radius = 6 inches, Circumference = 37.68 inches and Area = 113.04 square inches

Circle 8

The radius is 10 inches.

This means that the diameter is 20 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 10$

$C = 62.8$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 10^2$

$A= 314$

Hence, the missing elements are:

Diameter = 20 inches, Circumference = 62.8 inches and Area = 314 square inches

Circle 9

The radius is 17 inches.

This means that the diameter is 34 inches

The circumference is calculated as:

$C = 2\pi r$

So, we have:

$C = 2 * 3.14 * 17$

$C = 106.76$

The area is:

$A= \pi r^2$

So, we have:

$A= 3.14 * 17^2$

$A= 907.46$

Hence, the missing elements are:

Diameter = 34 inches, Circumference = 106.76 inches and Area = 907.46 square inches

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