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$Date Name Find the perimeter and area of the shaded section. Fill in each ◻. (1) Perimeter of the shaded section = Circumference of the 16cm circle + Circumference of the 8cm circle =(◻×3.14)+(◻×3.14) [ ] ◻ + ◻ = ◻ cm Area of the shaded section = Area of the 16cm circle - Area of the 8cm circle {:[=(◻×◻×3.14)-(◻×◻×3.14)],[=◻-◻cm^(2)]:} 3$

Date $\newline$ Name $\newline$ Find the perimeter and area of the shaded section. Fill in each $\square$ . $\newline$ ( $1$ ) $\newline$ Perimeter of the shaded section $\newline$ $=$ Circumference of the $16 \mathrm{~cm}$ circle + Circumference of the $8 \mathrm{~cm}$ circle $\newline$ $=(\square \times 3.14)+(\square \times 3.14)$ $\newline$ $=$ $\newline$ $\square$ $+$ $\square$ $=$ $\square$ $\mathrm{cm}$ $\newline$ Area of the shaded section $\newline$ $=$ Area of the $16 \mathrm{~cm}$ circle - Area of the $8 \mathrm{~cm}$ circle $\newline$ $\begin{array}{l} =(\square \times \square \times 3.14)-(\square \times \square \times 3.14) \\ =\square-\square \mathrm{cm}^{2} \end{array}$ $\newline$ $3$

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Q. Date

\newline

Name

\newline

Find the perimeter and area of the shaded section. Fill in each

\square

\newline

(

1

)

\newline

Perimeter of the shaded section

\newline

=

Circumference of the

16 \mathrm{~cm}

circle + Circumference of the

8 \mathrm{~cm}

circle

\newline

=(\square \times 3.14)+(\square \times 3.14)

\newline

=

\newline

\square

+

\square

=

\square

\mathrm{cm}

\newline

Area of the shaded section

\newline

=

Area of the

16 \mathrm{~cm}

circle - Area of the

8 \mathrm{~cm}

circle

\newline

\begin{array}{l} =(\square \times \square \times 3.14)-(\square \times \square \times 3.14) \\ =\square-\square \mathrm{cm}^{2} \end{array}

\newline

3

Calculate Circumference: Perimeter of the shaded section = Circumference of the $16\,\text{cm}$ circle + Circumference of the $8\,\text{cm}$ circle. Circumference of a circle = $2 \cdot \pi \cdot \text{radius}$ . For the $16\,\text{cm}$ circle, radius = $16\,\text{cm}$ , so circumference = $2 \cdot \pi \cdot 16$ . For the $8\,\text{cm}$ circle, radius = $8\,\text{cm}$ , so circumference = $2 \cdot \pi \cdot 8$ .
Calculate Perimeter: Calculate the circumference of the $16\,\text{cm}$ circle: $2 \times 3.14 \times 16 = 100.48\,\text{cm}$ . Calculate the circumference of the $8\,\text{cm}$ circle: $2 \times 3.14 \times 8 = 50.24\,\text{cm}$ .
Calculate Area: Add the circumferences to find the perimeter: $100.48\,\text{cm} + 50.24\,\text{cm} = 150.72\,\text{cm}$ .
Subtract Areas: Area of the shaded section = Area of the $16\,\text{cm}$ circle - Area of the $8\,\text{cm}$ circle. $\newline$ Area of a circle = $\pi \times \text{radius}^2$ . $\newline$ For the $16\,\text{cm}$ circle, radius = $16\,\text{cm}$ , so area = $\pi \times 16^2$ . $\newline$ For the $8\,\text{cm}$ circle, radius = $8\,\text{cm}$ , so area = $\pi \times 8^2$ .
Subtract Areas: Area of the shaded section = Area of the $16\,\text{cm}$ circle - Area of the $8\,\text{cm}$ circle. $\newline$ Area of a circle = $\pi \times \text{radius}^2$ . $\newline$ For the $16\,\text{cm}$ circle, radius = $16\,\text{cm}$ , so area = $\pi \times 16^2$ . $\newline$ For the $8\,\text{cm}$ circle, radius = $8\,\text{cm}$ , so area = $\pi \times 8^2$ .Calculate the area of the $16\,\text{cm}$ circle: $8\,\text{cm}$ $0$ . $\newline$ Calculate the area of the $8\,\text{cm}$ circle: $8\,\text{cm}$ $2$ .
Subtract Areas: Area of the shaded section = Area of the $16\,\text{cm}$ circle - Area of the $8\,\text{cm}$ circle. $\newline$ Area of a circle = $\pi \times \text{radius}^2$ . $\newline$ For the $16\,\text{cm}$ circle, radius = $16\,\text{cm}$ , so area = $\pi \times 16^2$ . $\newline$ For the $8\,\text{cm}$ circle, radius = $8\,\text{cm}$ , so area = $\pi \times 8^2$ .Calculate the area of the $16\,\text{cm}$ circle: $8\,\text{cm}$ $0$ . $\newline$ Calculate the area of the $8\,\text{cm}$ circle: $8\,\text{cm}$ $2$ .Subtract the area of the $8\,\text{cm}$ circle from the area of the $16\,\text{cm}$ circle: $8\,\text{cm}$ $5$ .