Mathematics, 28.10.2020 17:00 blackberri9675

105. A circular sector has an 8.26-inch radius and a 12.84-inch arc length. There is another sector that has the same area and the same perimeter. What are its measurements

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Answer from: evelin2318

As the radius of a sector decreases, the arc length increases to have an

equal area with a sector with a radius that is longer.

The measurements of another sector with the same perimeter and area are;

The radius of an alternative sector is 6.42 inchesThe arc length of an alternative sector is 16.52 inches

Reasons:

Radius of the sector, r = 8.26 inches

Arc length of the sector = 12.84 inches

Perimeter of sector = 2·r + Arc length

Perimeter of the given sector = 2 × 8.26 inch + 12.84 inch = 29.36 inch

Circumference of the circle = 2 × 8.26 × π = 16.52·π

Area of the given circle, A = π × 8.26² = 68.2276·π

$\displaystyle Area \ of \ sector = \frac{12.84}{16.52 \cdot \pi} \times 68.2276 \cdot \pi = 53.0292$

Area of the sector, A = 53.0292 inch²

Therefore, we have;

2·R + A = 29.36 inches

$\displaystyle \mathbf{\frac{A}{2\cdot \pi \cdot R} \times \pi \cdot R^2} = 53.0292$

A·R = 53.0292 × 2

$\displaystyle New \ arc \ length, \ A = \mathbf{\frac{53.0292 \times 2}{R}}$

Which gives;

$\displaystyle 2 \cdot R + \frac{53.0292 \times 2}{R} = 29.36$

$\displaystyle R + \frac{53.0292 }{R} = 14.68$

R² + 53.0292 = 14.68·R

R² - 14.68·R + 53.0292 = 0

Factorizing with a graphing calculator, gives;

(R - 6.42)·(R - 8.26) = 0

R = 6.42 or R = 8.26

The measurement of R = 8.26 is for the first sector

Given that the sectors are different, we have;

The radius of the other sector, R = 6.42 inches

The arc length, A = 29.36 - 2·R

∴ A = 29.36 - 2 × 6.42 = 16.52

The arc length of the other sector, A = 16.52 inches

Learn more about the sector of a circle here:

link

Answer from: lclaudettecarte3550

Area of another sector= 53.0292 in^2

Perimeter of another sector=29.36 in

Step-by-step explanation:

We are given that

Radius, r=8.26 in

Arc length , l=12.84 in

Area of circular sector= $\frac{arc\;length} {Circumference\;of\;circle}\times \pi r^2$

Area of circular sector= $\frac{l}{2\pi r}\times \pi r^2=\frac{l}{2}\times r$

Where Circumference of circle= $2\pi r$

Substitute the values

Area of circular sector= $\frac{12.84}{2}\times (8.26}$

Area of circular sector= 53.0292 in^2

Area of another sector= 53.0292 in^2

Perimeter of circular sector=8.26+8.26+12.84

Perimeter of circular sector=29.36 in

Perimeter of another sector=29.36 in

Answer from: Quest

It is 198,87032,750 + 375 = 33145 so, we take the 6% and we make it a decimal (0.6) and multiply that, then that is your answer

Answer from: Quest

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m 60 second 60 minutes

* * = 54000 meters/ hour

second 1 minute 1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m 1 km

* = 54 km / hours

hour 1000m

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