4 years ago

Find the circumference and the area of a circle with diameter 7 cm

Mathematics

1 answer:

zepelin [54]4 years ago

3 0

Circumference formula: diamter*pi=7pi
Area = pi*r^2=pi(3.5)^2=12.25pi.

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Karissa begins to solve the equation (x – 14) + 11 = x – (x – 4). Her work is correct and is shown below. (x – 14) + 11 = x – (x

sdas [7]

Her work is incorrect because she accidentally changed -14 to -7 in the second step.
Working it out from the top we get
(x-14)+11=x-(x-4)
x-14+11=x-x+4
x-3=0+4
Final answer:
x=7
Hope I helped :)

4 0

4 years ago

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Reil [10]

I honestly don't know if this is correct but it might be i think its the middle one y=f(x)=x to the second power

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4 years ago

the average rainfall in Clearview is 38 inches . this year 29.777 inches fell . How much less rain fell this year than falls in

dexar [7]

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4 years ago

Finding area of shaded sectors.

tekilochka [14]

Answer:

69.81 sq. m. (rounded to 2 decimal places)

Step-by-step explanation:

The sector of a circle is "part" or "portion" of a circle. The formula for the area of a sector is:

$A=\frac{\theta}{360}*\pi r^2$

Where

$\theta$ is the central angle

r is the radius

Given the figure, the arc is given as 80 degrees, but not the central angle of the shaded sector. But from geometry we know that the central angle and the intercepted arc have the same measure. So we can say:

$\theta = 80$

Also, the radius of the circle shown is 10 meters, so

r = 10

Now, we substitute in formula and find our answer:

$A=\frac{\theta}{360}*\pi r^2\\A=\frac{80}{360}*\pi (10)^2\\A=\frac{2}{9}*100\pi\\A=\frac{200\pi}{9}\\A=69.81$

Thus,

The area of the shaded sector is 69.81 sq. meters.

5 0

3 years ago

If the sum of a number and six is tripled, the result is eight less than twice the number. Find the number.

PSYCHO15rus [73]

3(x+6)=2x-8

x= -26

the answer is -26

7 0

3 years ago