8) can u answer this question pls

Mathematics

1 answer:

Vsevolod [243]2 years ago

3 0

Answer: 346.19cm²

Step-by-step explanation:

π= 3.14

Divide 21 (the diameter) by 2 to get the radius( it 's half of the diameter). so the radius is 10.5

Area= πr²

= 3.14x10.5x10.5

= 346.185

So next round up the value you got to the nearest tenth, so when u round up to the nearest tenth you get 346.19

You might be interested in

By how much will the value of the number

lisov135 [29]

Answer: 2,000

Step-by-step explanation:it’s 2,000 because the 7 is in the thousand place and 7 minus 5 = 2.

7 0

3 years ago

Performin' just like my 'Rari

tatuchka [14]

Answer: wow

Step-by-step explanation:

6 0

3 years ago

the perimeter of a rectangle is 56 m. if the width were doubled and the length were increased by 8 m, then the perimeter would b

Natasha2012 [34]

----------------------------------------------------------------
Define x and y:
----------------------------------------------------------------
Let the length be x.
Let the width be y.

----------------------------------------------------------------
Formula:
----------------------------------------------------------------
Perimeter = 2(Length + Width)

----------------------------------------------------------------
Construct equations and solve for x and y:
----------------------------------------------------------------
2x + 2y = 56 ---------------------- (1)
2(x+8) + 4y = 82 -----------------------(2)

----------------------------------------------------------------
From equation 1:
----------------------------------------------------------------
2x + 2y = 56
x + y = 28
x = 28 - y

----------------------------------------------------------------
From equation 2:
----------------------------------------------------------------
2(x+8) + 4y = 82
2x + 16 + 4y = 82
2x + 4y = 66
x + 2y = 33

----------------------------------------------------------------
Substitute x = 28 - y into equation 2:
----------------------------------------------------------------
x + 2y = 33
(28 - y) + 2y = 33
28 - y + 2y = 33
y = 5

----------------------------------------------------------------
Substitute y = 5 into equation 1:
----------------------------------------------------------------
x = 28 - y
x = 28 - 5
x = 23

----------------------------------------------------------------
Find Length and Width
----------------------------------------------------------------
Length = x = 23 m
Width = y = 5m

----------------------------------------------------------------
Answer: Length = 23m and Width = 5m
----------------------------------------------------------------

3 0

3 years ago

In a recent survey of college-educated adults, 324 indicated that they regularly work more than 45 hours a week. If this represe

Arlecino [84]

Answer:

900 people

Step-by-step explanation:

.36x=324

×=324÷.36

x=900

6 0

3 years ago

the volume of a rectangular pyramid is 192 cubic units. if it's dimensions are reduced to one-fourth their original lemgth. what

vekshin1

We know that
scale factor=1/4
so
volume of the smaller pyramid=[scale factor]³*volume original pyramid
volume original pyramid=192 unit³
volume of the smaller pyramid=[1/4]³*192---> (1/64)*192----> 3 units ³

the answer is

3 units³

4 0

3 years ago