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Degger [83]
3 years ago
12

Included an attachment ! ( 20 POINTS ) !

Mathematics
1 answer:
lianna [129]3 years ago
7 0

Answer:

50.24, 120.7, 254.34, 415.27, 25.5, 1.77

Step-by-step explanation:

<u>The formula for finding the area of a circle is πr²:</u>

In that case, we can substitute each value in each circle  as r.

Circle 1 (radius 4 cm.)

We first begin by squaring our 4. That gives an answer of 16. Now, we multiply by 3.14. Since 16 * 3.14 = 50.24. It asks for all answers to be rounded to the nearest hundredth, though. In that case, our answer still remains 50.24

Circle 2 (radius 6.2 in.)

We first begin by squaring our 6.2. That gives an answer of 38.44.  Since 38.44 * 3.14 gives an answer of 120.7016. Rounding gives 120.70.

Circle 3  (diameter 18 ft.)

We first begin by dividing 18 by 2. That is because the diameter is twice the radius. Now we have 9 squared which gives an answer of 81. 81 * 3.14 = 254.34. Thus, our answer is 254.34 because it cannot be rounded.

Circle 4 (radius 11.5 m.)

We first begin by squaring 11.5. That gives an answer of 132.25. Multiplying by 3.14 gives an answer of 415.265. Rounding gives 415.27.

Circle 5 (diameter 5.7 cm.)

We first begin by dividing 5.7 by 2. (note: this circle is like circle 3). That gives an answer of 2.85. 2.85^2 = 8.1225. Multiplying by 3.14 = 25.50465 . Rounding gives 25.50. Thus our answer is 25.50

Circle 6 (radius 0.75 in.)

We first begin by squaring 0.75. That gives an answer of 0.5625. Now, we multiply times 3.14. That gives an answer of 1.76625. Rounding gives 1.77 as our final answer.

Hope this helps!

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Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
Maurinko [17]

Answer:

616 square centimeters

Step-by-step explanation:

Area of a circle is equal to pi × r^2. In this case, they have asked that you substitute 3.14 or 22/7 for pi, so I will be using 22/7, instead.

Diameter is equal to 2r; to find the radius, simply divide 28 by two. This gives us a radius of 14.

Multiply 14 squared by 22/7:

(22/7)(14^2)

This gives us (22/7)(196); (4312/7); 616.

Therefore, the area of the circle is approximately 616 square centimeters.

8 0
2 years ago
What is 2x-3=4(x-5)? And also what is 2x squared=50?
Ierofanga [76]
2x - 3 = 4(x - 5)
2x - 3 = 4x - 20
4x - 2x = 20 - 3
2x = 17
x = 8 1/2

2x² = 50
x² = 25
x = \pm√25
x = \pm5


6 0
3 years ago
3x^2-12x-21=0 solve by completing the square
morpeh [17]

Answer:

x = 2 ± √11 (I believe)

Step-by-step explanation:

3 0
3 years ago
Which equation is equivalent to ry (3x +2y) = 4?
d1i1m1o1n [39]

Answer:

I pretty sure it's C or lllll

3 0
3 years ago
Convert the angle 61 38’ 45” to decimal degrees, and round to the nearest hundredth of a degree
slega [8]
A suitable calculator* can do this easily.

61°38'45" = (61 +(38 +45/60)/60)° ≈ 61.65°

_____
I like the RealCalc app for Android, but many graphing calculators also will do this conversion. Of course, you can simply evaluate the expression as above.
6 0
3 years ago
Read 2 more answers
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