What is the best approximation for the area of the …

Mathematics Questions

What is the best approximation for the area of the figure with a semicircular part? Options: A) 28 + 16.25œA units¬≤ B) 14 + 16.25œA units¬≤ C) 14 + 8.125œA units¬≤ D) 28 + 8.125œA units¬≤

Short Answer

The diameter of the semicircle is calculated using the distance formula, resulting in ‚ao65. The radius is half of the diameter, leading to an area of 8.125œA square units for the semicircle, while the area of the triangle formed by the endpoints is 14 square units, making the total area 14 + 8.125œA square units.

Step-by-Step Solution

Step 1: Calculate the Diameter of the Semicircle

To determine the diameter of the semicircle, we must connect the two endpoints: (3, 2) and (-4, -2). We apply the distance formula to find the length between these two points. The formula is given by:

  • Diameter = ‚Äöao{(-4 – 3)¬¨‚â§ + (-2 – 2)¬¨‚â§}
  • Calculate: = ‚Äöao{(-7)¬¨‚â§ + (-4)¬¨‚â§}
  • Result: = ‚Äöao{49 + 16} = ‚Äöao65

Step 2: Determine the Radius and Area of the Semicircle

The radius of the semicircle is half of the diameter, calculated as follows:

  • Radius = ‚Äöao65 / 2
  • Using the radius, we will find the area of the semicircle using the formula: Area = (1/2)≈ìAr¬¨‚â§.
  • Substituting the radius: Area = (1/2)≈ìA(‚Äöao65 / 2)¬¨‚â§ = 8.125≈ìA square units.

Step 3: Calculate Area of the Triangle and Total Area

Next, we need to determine the area of the triangle formed by the endpoints. The base is calculated as:

  • Base = 3 – (-4) = 7
  • Height = 2 – (-2) = 4
  • Area of the triangle = (1/2) ‚àöo Base ‚àöo Height = (1/2) ‚àöo 7 ‚àöo 4 = 14 square units.

Finally, the total area is the sum of the area of the semicircle and the triangle: Total Area = 14 + 8.125œA square units.

Related Concepts

Distance Formula

A mathematical formula used to determine the distance between two points in a coordinate plane, calculated as ‚Äöao{(x‚Äöcc – x‚Äöca)¬¨‚â§ + (y‚Äöcc – y‚Äöca)¬¨‚â§}

Radius

The distance from the center of a circle or semicircle to its edge, which is equal to half of the diameter

Area

The amount of space enclosed within a shape, calculated for the semicircle as (1/2)œar¬≤ and for the triangle as (1/2) √o base √o height.

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