4. a) Find the perimeter of a circle with radius 3.5 cm . b) Find the area of a circle with radius 14 cm . c) Find the perimeter and area of a circle with diameter 14 m .

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a) To find the perimeter of a circle with radius $$ r = 3.5 \, \text{cm} $$, we use the formula for the circumference of a circle:
$$ C = 2\pi r $$

Substitute the given radius into the formula:
$$ C = 2\pi \times 3.5 $$

Now, we can calculate the circumference of the circle.

b) To find the area of a circle with radius $$ r = 14 \, \text{cm} $$, we use the formula for the area of a circle:
$$ A = \pi r^2 $$

Substitute the given radius into the formula:
$$ A = \pi \times 14^2 $$

Now, we can calculate the area of the circle.

c) To find the perimeter and area of a circle with diameter $$ d = 14 \, \text{m} $$, we first need to find the radius by dividing the diameter by 2:
$$ r = \frac{d}{2} $$

Then, we can calculate the circumference and area using the formulas:
$$ C = 2\pi r $$
$$ A = \pi r^2 $$

Let's calculate the values for each part.
Calculate the value by following steps:
- step0: Calculate:
  $$2\pi \times 3.5$$
- step1: Multiply the terms:
  $$7\pi $$
a) The perimeter of the circle with radius 3.5 cm is approximately $$ 21.99 \, \text{cm} $$.

Next, let's calculate the area of the circle with radius 14 cm.
Calculate the value by following steps:
- step0: Calculate:
  $$\pi \times 14^{2}$$
- step1: Evaluate the power:
  $$\pi \times 196$$
- step2: Multiply:
  $$196\pi $$
b) The area of the circle with radius 14 cm is approximately $$ 615.75 \, \text{cm}^2 $$.

Now, let's find the perimeter and area of the circle with diameter 14 m.
Calculate the value by following steps:
- step0: Calculate:
  $$\pi \left(\frac{14}{2}\right)^{2}$$
- step1: Divide the terms:
  $$\pi \times 7^{2}$$
- step2: Evaluate the power:
  $$\pi \times 49$$
- step3: Multiply:
  $$49\pi $$
c) The area of the circle with diameter 14 m is approximately $$ 153.94 \, \text{m}^2 $$.

Next, let's calculate the perimeter of the circle with diameter 14 m.
Calculate the value by following steps:
- step0: Calculate:
  $$2\pi \left(\frac{14}{2}\right)$$
- step1: Divide the terms:
  $$2\pi \times 7$$
- step2: Multiply the terms:
  $$14\pi $$
c) The perimeter of the circle with diameter 14 m is approximately $$ 43.98 \, \text{m} $$.

Therefore, the answers are:
a) Perimeter of the circle with radius 3.5 cm is approximately 21.99 cm.
b) Area of the circle with radius 14 cm is approximately 615.75 cm².
c) Perimeter of the circle with diameter 14 m is approximately 43.98 m, and the area is approximately 153.94 m².
a) Perimeter: 21.99 cm, b) Area: 615.75 cm², c) Perimeter: 43.98 m, Area: 153.94 m²

4. a) Find the perimeter of a circle with radius 3.5 cm . b) Find the area of a circle with radius 14 cm . c) Find the perimeter and area of a circle with diameter 14 m .

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