8. A DVD has a diameter of 12 centimeters. What is the area of the DVD? Round
your answer to the nearest hundredth.
9. A company makes steel lids that have a diameter of 13 inches. What is the
area of each lid? Round your answer to the nearest hundredth.
10. A circular garden has an area of 64 square yards. What is the circumference
of the garden? Give your answer in terms of .
11. Reasoning A small silver dollar pancake served at a restuarant has a circumference
of 27 inches. A regular pancake has a circumference of 4 inches. Is the area of the
regular pancake twice the area of the silver dollar pancake? Explain.

Part 8) The area of DVD is 113.04 square centimeters

Part 9) The area of each lid is 132.67 square inches

Part 10) The circumference of the garden is

Part 11) No, the area of the regular pancake is 4 times the area of the small pancake

Step-by-step explanation:

Part 8) we know that

The area of the circle is given by the formula

where

r is the radius

we have

---> the radius is half the diameter

assume

substitute

Part 9) we know that

The area of the circle is given by the formula

where

r is the radius

we have

---> the radius is half the diameter

assume

substitute

Part 10)

step 1

we know that

The area of the circle is given by the formula

where

r is the radius

we have

substitute

solve for r

simplify and take square root both sides

step 2

Find the circumference of the garden

we know that

The circumference of the circle is given by

we have

substitute

Part 11)

The correct question is

A small silver dollar pancake served at a restaurant has a circumference

of 2 inches. A regular pancake has a circumference of 4 inches. Is the area of the  regular pancake twice the area of the silver dollar pancake?

step 1

Find the scale factor

we know that

All circles are similar

so

The ratio of its circumferences is equal to the scale factor

Let

z ----> the scale factor

x ---> circumference of the regular pancake

y ----> circumference of the small silver dollar pancake

so

substitute the given values

step 2

If two figures are similar, then the ratio of its areas is equal to the scale factor squared

Let

z ----> the scale factor

x ---> area of the regular pancake

y ----> area of the small silver dollar pancake

so

we have

substitute

solve for x

therefore

The area of the regular pancake is 4 times the area of the small pancake

1/2*qr*rs

step-by-step explanation:

answer: 1 + 1 = 11

step-by-step explanation: