Math Problem Statement

find the area of the shaded region (four decimal places)

Solution

To find the area of the shaded region, we'll start by calculating the area of the entire sector and then focus on the shaded part.

Step 1: Calculate the Area of the Whole Sector

The formula for the area of a sector is:

Sector Area=(angle of sector360)×πr2\text{Sector Area} = \left(\frac{\text{angle of sector}}{360}\right) \times \pi r^2

Given:

  • Angle of the sector = 4848^\circ
  • Radius r=14 cmr = 14 \text{ cm}

Substitute the values into the formula:

Sector Area=(48360)×π×(14)2\text{Sector Area} = \left(\frac{48}{360}\right) \times \pi \times (14)^2

Sector Area=(48360)×π×196\text{Sector Area} = \left(\frac{48}{360}\right) \times \pi \times 196

Sector Area=(48360)×615.7522 cm2(using π3.1416)\text{Sector Area} = \left(\frac{48}{360}\right) \times 615.7522 \text{ cm}^2 \quad (\text{using } \pi \approx 3.1416)

Sector Area=(48360)×615.7522\text{Sector Area} = \left(\frac{48}{360}\right) \times 615.7522

Sector Area=0.1333×615.7522=82.1003 cm2\text{Sector Area} = 0.1333 \times 615.7522 = 82.1003 \text{ cm}^2

So, the area of the whole sector is 82.1003 cm² (rounded to four decimal places).

Step 2: Determine the Area of the Shaded Region

Since the problem specifies finding the area of the shaded region, which appears to be part of the sector, the area we've just calculated is already for the specific sector. If the shaded part refers only to this sector, then the shaded region area is 82.1003 cm².

Would you like more details or have any questions about this? Here are some related questions that could help deepen your understanding:

  1. How do we calculate the area if the shaded region is a segment and not the entire sector?
  2. What changes if the angle of the sector is different?
  3. How do you find the perimeter of the sector?
  4. What happens to the sector area if the radius is doubled?
  5. How would you calculate the area of a sector if only the arc length is known?

Tip: Always double-check if the shaded region refers to a sector, a segment, or another specific part of a circle before finalizing your answer.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circle Sector Area

Formulas

Area of a sector formula: (θ/360) × πr²

Theorems

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Suitable Grade Level

Grades 9-12