66.8k views
15 votes
I need help with this

I need help with this-example-1
User Jon Ross
by
7.6k points

1 Answer

10 votes


\bold\color{plum}\tt \: Answer \: \: 1 :

Diameter = 4 cm

Radius = Diameter/2 = 2 cm

Area of circle :


= \pi{r}^(2)


= 3.14 * 2 * 2


= 3.14 * 4


= 12.56 \: {cm}^(2)

Circumference of circle :


= 2\pi r


= 2 * 3.14 * 2


= 12.56 \: \: {cm}^(2)

Therefore,

Diameter = 4 cm

Radius = 2 cm

Area = 12.56 cm²

Circumference = 12.56 cm


\bold{\color{plum}\tt \: Answer \: \: 2 :}

Circumference = 15 feet (given)

Radius :


= 2\pi r


= 2 * (22)/(7) * r = 15


= (44)/(7) * r = 15


= 44r = 15 * 7


= 44r = 105


= r = (105)/(44)


= r = 2.38 \: feet

Diameter = r×2 = 2.38 × 2 = 4.76 feet

Area :


= \pi {r}^(2)


= 3.14 * 2.38 * 2.38


= 17.78 \: {ft}^(2)

Therefore,

Diameter = 4.76 feet

Radius = 2.38 feet

Area = 17.78 ft²

Circumference = 15 feet


\color{plum}\tt \: Answer \: \: 3 :

Diameter = 2 cm (given)

Radius = D/2 = 2/2 = 1 cm

Circumference :


= 2 \pi r


= 2 * 3.14 * 1


= 6.28 \: feet

Area :


= \pi {r}^(2)


= 3.14 * 1 * 1


= 3.14 \: {ft}^(2)

Therefore,

Diameter = 2 cm

Radius = 1 cm

Area = 3.14 ft²

Circumference = 6.28 feet


\color{plum}\tt \: Answer \: \: 4 :

Radius = 4.3 mm

Diameter = r×2 = 4.3 × 2 = 8.6 mm

Circumference :


= 2\pi r


= 2 * 3.14 * 4.3


= 27 \: mm

Area :


= \pi {r}^(2)


= 3.14 * 4.3 * 4.3


= 3.14 * 18.49


= 58.05 \: {mm}^(2)

Therefore,

Diameter = 8.6 mm

Radius = 4.3 mm

Area = 58.95 mm²

Circumference = 27 mm

User Dimanoid
by
8.0k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories