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lidiya [134]
3 years ago
9

Find the Area of the circle. Use 3.14 for π. Round your answer to the nearest tenth.

Mathematics
2 answers:
Zanzabum3 years ago
5 0

Answer:

1, 385.4 mi

Step-by-step explanation:

A = pi(r^2)

A = 3.14 x 21^2

A = 1385.44 mi

n200080 [17]3 years ago
3 0

Answer:

Area = 1384.7 square miles

Step-by-step explanation:

Area = \pi r^2 = 3.14 \times 21^2 = 3.14 \times 21 \times 21 = 1384.74 = 1384.7 \ mi^2

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7 rectangles in every 140 cm.how many rectangles will be presented in 220 cm
Monica [59]
140/7=20
220/20=11
the answer is 11
5 0
3 years ago
Find the other two vertices of a square with one vertex (0, 0) and another vertex (4, 2). Can you find another answer?
Margarita [4]

It is given that two vertices of square are (0,0) and (4,2).

Now the problem is that you haven't given that whether these two vertices are adjacent vertices or opposite vertices of the square.

1. By Supposing that these two are adjacent vertices of Square

The third vertex will be at (-4,2) which lies in third quadrant.

Suppose the coordinate of fourth vertex be (x,y).

Mid point of line joining (4,2) and (-4,2) is{ [4+(-4)]/2,(2+2)/2} is (0,2).

Mid point of line joining (x,y) and (0,0) is (x/2,y/2).

Since diagonals of square bisect each other,

∵ x/2=0

⇒x=0

and

y/2=2

⇒y=4

So, The Coordinate of  fourth vertex is (0,4).

Now coming back to second condition if these are two opposite vertex of Square.

Let the third coordinate be (a,b).

Length of diagonal=\sqrt{(4-0)^2+(2-0)^2}=\sqrt20=2\sqrt5

Now,let side of Square be A.

Then length of Diagonal of square =√2 A

⇒√2 A=2√5

⇒A =√10

As third vertex is (a,b).

Using distance formula

a² + b²=10  -------------(1)

(a-4)²+ (b-2)²=10  --------------(2)

Solving expression (1) and (2), we get

⇒a²+ b²=(a-4)² +(b-2)²

⇒2a + b =5

⇒b=5-2a

Putting the value of b in (1),we get

⇒a² +(5-2a)²=10

⇒a²+25+4a²-20a =10

⇒5a²-20a+15=0

⇒a² - 4a + 3=0

Splitting the middle term,we get

⇒(a-3)(a-1)=0

⇒a=3  ∧  a=1

we get b=5-2×1=3 and b=5-2×3=5-6=-1

So,the other vertex are (1,3) and(3,-1).





3 0
3 years ago
19. Michelle and Mike are both dog sitters. Michelle charges $2 per day plus a sign-up fee of
user100 [1]

Answer:

See below

Step-by-step explanation:

Michelle

  • y = 3+2x

Mike

  • y = 3x
8 0
3 years ago
If x =7 what are the possible values of x
Lorico [155]

Answer:

the value of x is x

Step-by-step explanation:

5 0
2 years ago
What is the surface area of this cylinder?
Nitella [24]

Answer:

<h3>1067.6 m²</h3>

Step-by-step explanation:

Given that

  • r = 10 m
  • h = 7 m
  • π ≈ 3.14

Find the surface area of the cylinder!

Equation =

  • 2πr × (r+h) =

(2 × 3.14 × 10) × (10 + 7) =

62.8 × 17 ≈

<h3>1067.6 m²</h3>

The surface area of the cylinder ≈ 1067.6 square metres

_________________

#Indonesian - kexcvi

6 0
3 years ago
Read 2 more answers
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