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Nezavi [6.7K]
3 years ago
8

THE TOPIC IS: AREA OF CIRCLES!! PLEASE HELP ME WITH THIS QUESTION!!! WHATS THE ANSWER?? I WILL GIVE YOU BRAINLIEST AND A THANKS!

!! THANK YOUUU!!! <33

Mathematics
1 answer:
emmainna [20.7K]3 years ago
5 0

9514 1404 393

Answer:

  49π m² ≈ 154 m²

Step-by-step explanation:

The formula for the area of a circle is usually remembered as ...

  A = πr² . . . . . for radius r

Here, we're given the diameter. We can either figure the radius from the diameter and use this formula, or we can rewrite the formula to use the diameter.

  r = d/2 = (14 m)/2 = 7 m

  A = π(7 m)² = 49π m² . . . . . "exact" answer

Sometimes when multiples of 7 are involved, we like to use π ≈ 22/7. Using that value, the area is ...

  A = 49π m² = 49(22/7) m² = 154 m² . . . . . approximation using π = 22/7

Often, algebra problems insist on using the value π = 3.14. For that value, the area is ...

  A = 49π m² = 49(3.14) m² = 153.86 m² . . . . . approximation using π = 3.14

Using the "pi button" on your calculator, the numeric answer is ...

  A ≈ 49(3.14159265359) m² ≈ 153.938 m² . . . . using "pi button"

_____

If we rewrite the formula to use the diameter directly, then the area is ...

  A = π(d/2)² = (π/4)d²

For the diameter of 14 m, this is ...

  A = (π/4)(14 m²) = π(196/4) m² = 49π m² . . . . same as above

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Triangle EFG is an isosceles triangle with EG=EF. What is the approximate length of EF, and what is the approximate perimeter of
sineoko [7]

Answer:

B. The approximate length of EF is 4.47 units, and the approximate perimeter of triangle EFG is 12.94 units.

Step-by-step explanation:

First step is to determine the length of EF, since that will give us 2 sides of the triangle (since EG = EF).

From the diagram, we can easily make a rectangle triangle by dropping a vertical line from vertex E, let's name Z the meeting point of that line with the segment GF.  Then we have a rectangle triangle EZF with a height of 4 and a base of 2, of which EF is the hypotenuse. So...

EF² = 4² + 2² = 16 + 4 = 20

EF = √20 = 4.47

Now that we have EF, we also have EG:

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7 0
3 years ago
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In your biology class, your nal grade is based on several things: a lab score, scores on two major tests, and your score on the
Mariana [72]

Complete Question

In your biology class, your final  grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 25% of your total grade, each major test is worth 22:5%, and the final exam is worth 30%. Compute the weighted average for the following scores: 92 on the lab, 81 on the first major test, 93 on the second major test, and 85 on the final exam. (Enter your answer to one decimal place)

Answer:

The weighted average is  W = 87.65

Step-by-step explanation:

From the question we are told that

  The worth of the lab score is  25% of total grade

  The worth of each major  test is   22.5% of total grade

   The worth of final exam is  30% of total grade

The  score on lab is  92

The score on first major test 81

The score on second major test 93

 The score on final  exam is  85

Generally the weighted score is mathematically represented as

     W = 0.25 *  92 + 0.225* 81 + 0.225* 93 +0.30 * 85

=> W = 0.25 *  92 + 0.225* 81 + 0.225* 93 +0.30 * 85

=> W = 87.65

   

   

3 0
3 years ago
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