Question

Find the area. Use 3.14 for pi and round your answer

Answer 1

Answer:

329.9 ft^2

Step-by-step explanation:

area = π · r^2

diameter = 2r so radius = 10.25

area = 3.14 · 10.25^2

10.25^2 = 105.06

3.14 · 105.06 = 329.9 ft^2

Answer 2

Given :-

• diameter = 20.5 ft
• π = 3.14

To find :-

• Area

Solution:

To find area first we should know value of radius.

Diameter is given , and from diameter we can find value of radius.

We know :-

$\bf \ddag\boxed{\rm Diameter =2 \: radius } \bf \ddag$

By using this formula we can find radius.

$\hookrightarrow\sf Diameter =2 \: radius$

$\hookrightarrow\sf 20.5 =2 \: radius$

$\hookrightarrow\sf \dfrac{205}{10} =2 \: radius$

$\hookrightarrow\sf \cancel\dfrac{205}{10} =2 \: radius$

$\hookrightarrow\sf \dfrac{41}{2} =2 \: radius$

$\hookrightarrow\sf2 \: radius = \dfrac{41}{2}$

$\hookrightarrow\sf \: radius = \dfrac{41}{2 \times 2}$

$\hookrightarrow\sf \: radius = \dfrac{41}{4}$

$\hookrightarrow\bf \: radius = 10.25$

Now let's find Area

we know :-

$\bf \ddag\boxed{\rm Area = \pi radius {}^{2} } \bf \ddag$

So:-

$\dashrightarrow \sf Area = \pi radius {}^{2}$

$\dashrightarrow \sf Area = \pi (10.5) {}^{2}$

$\dashrightarrow \sf Area = \pi \times 10.5 \times 10.5$

$\dashrightarrow \sf Area = \pi \times 110.25$

$\dashrightarrow \sf Area = 3.14 \times 110.25$

$\dashrightarrow \bf Area =346.19~ {ft}^{2} \{approx\}$