All categories

3 years ago

Please helpFind the unknown radius of the circle. A measures 628 sq cm find r

Mathematics

1 answer:

stira [4]3 years ago

5 0

Answer:

14.14 cm

Step-by-step explanation:

The formula for the area of a circle is : $\pi *radius^2$

In order to find the radius you would first have to divide the area of 628 by pi, this gives you 200. This is because by dividing the area by pi it will leave us with the radius squared.

The next step is to find the square root of 200, this gives us 14.14. This is because by finding the square root it will leave us with the radius. The square root is another number that when multiplied by itself equals the number.

1) Divide 628 by pi.

$628/\pi =200$

2) Find the square root of 200.

$\sqrt{200}=14.14$

Pi as in 3.14

You might be interested in

If the trapezoid on the grid below is translated by using the rule (x,y)-> (x-4,y-3) what will be the coordinates of B’?

vesna_86 [32]

Answer:

B'(3, 5)

Step-by-step explanation:

Rule for the translation of a point (x, y) by 'h' units left and 'k' units upwards,

(x, y) → (x - h, y + k)

If h = 4 and k = 3,

$(x, y)\rightarrow(x-4,y+3)$

Following this rule coordinates of the image point of B will be,

B(7, 2) → B'(7 - 4, 2 + 3)

→ B'(3, 5)

Therefore, coordinates of the image point B' will be,

B'(3, 5)

6 0

3 years ago

Mrs aleaze tells her stuents there will be 50 questions on their test and 20 percent of them will be word problems how much prob

timofeeve [1]

The word problem only gives you two numbers, so it would be easy to assume that the questions involves those two numbers. However, in this case, the question requires that you calculate another answer first: the number of questions Abel got right. You'll need to subtract 4 from 80, then calculate the percentage of the difference:

80-4=78, and 78/80*100=97.5 percent So it will be 50

6 0

3 years ago

Jan has $130 she saves $25 per week determine how many weeks it will take for her to have $600

vlabodo [156]

130 + 25x = 600

25x = 470

X = 18.8

Approximately 19 weeks

6 0

4 years ago

Read 2 more answers

During one month, a homeowner used 500 units of electricity and 100 units of gas for a total cost of $333. The next month, 400 u

Mice21 [21]

Answer: the cost per unit of gas is $0.28

Step-by-step explanation:

Let x represent the cost per unit of electricity.

Let y represent the cost per unit of gas.

During one month, a homeowner used 500 units of electricity and 100 units of gas for a total cost of $333. This is expressed as

500x + 100y = 333 - - - -- - -- - -- -1

The next month, 400 units of electricity and 150 units of gas were used for a total cost of $286. This is expressed as

400x + 150y = 286 - - - - - - - - - --2

Multiplying equation 1 by 400 and equation 2 by 500, it becomes

200000x + 40000y = 133200

200000x + 75000y = 143000

Subtracting, it becomes

- 35000y = - 9800

y = - 9800/- 35000

y = 0.28

Substituting y = 0.28 into equation 2, it becomes

400x + 150 × 0.28 = 286

400x = 286 - 42 = 244

x = 244/400 = 0.61

7 0

3 years ago

Help me with my math don't get it! ;(

Vlad [161]

Answer:

Step-by-step explanation:

So, we know that this inequality has an "at most" in its phrase, therefore signifying the sign x <em>≤</em> 5. Since the x is in the left side without any negatives, so <em>the arrow goes left, and the circle is filled</em>. So, B.

7 0

3 years ago

Please helpFind the unknown radius of the circle. A measures 628 sq cm find r ​

Please helpFind the unknown radius of the circle. A measures 628 sq cm find r