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3 years ago

If the area of a circle is 121 pi square units, what is its diameter

Mathematics

2 answers:

postnew [5]3 years ago

8 0

Answer:22

Step-by-step explanation:

diameter=d

Area=121π

area of circle=π x (d/2)^2

121π=π x d^2/4

121π=πd^2/4

Cross multiplying we get

121π x4=πd^2

484π=πd^2

Divide both sides by π

484π/π=πd^2/π

d^2=484

Taking the square roots of both sides we get

d=√(484)

d=22 diameter=22

zzz [600]3 years ago

5 0

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MrMuchimi

$\displaystyle\\
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6 0

3 years ago

Read 2 more answers

A rule of thumb for estimating the size of a crowd is that 2 people take up

Leno4ka [110]

Answer:

120 people

Step-by-step explanation:

Length of dance floor = 30 ft

Width of dance floor = 20 ft

Given that 2 people will occupy 5 ft² of space, the number of people that will crowd the floor of the dance floor is calculated as follows:

= Area of dance floor ÷ 5 ft²

= (30*20) ÷ 5

= 600 ÷ 5

= 120.

120 people will crowd the dance floor.

8 0

3 years ago

10y - 3y = 15 graph using the table of values

harina [27]

Answer:

y+15/7

Step-by-step explanation:

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3 years ago

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tigry1 [53]

Step-by-step explanation:

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8 0

2 years ago

Answer please !<br> both questions 7 and 8

Elodia [21]

Answer:

7) p=80

8)z= 19.2

Step-by-step explanation:

7th problem)

0.1p=8

p * $10^{-1}$ =8

$\frac{p}{10}$ =8

p=80

8th problem)

$\frac{z}{2.4}$ =8

z=8*2.4

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3 0

3 years ago