Math Problem Statement

cari lah luas yang di arsir

cari lah luas yang di arsir

Solution

To calculate the area of the shaded region in the given diagram:

  1. Understand the geometry: The figure is a square with side length 10cm10 \, \text{cm}, and the arcs are segments of circles with radii equal to the side length of the square. These arcs represent portions of a quarter-circle, where the circle's radius equals 10cm10 \, \text{cm}.

  2. Calculate the area of the square: Area of square=side2=102=100cm2\text{Area of square} = \text{side}^2 = 10^2 = 100 \, \text{cm}^2

  3. Calculate the total area of the quarter-circle arcs: Each quarter-circle has an area of: Area of one quarter-circle=14πr2=14π(10)2=25πcm2\text{Area of one quarter-circle} = \frac{1}{4} \pi r^2 = \frac{1}{4} \pi (10)^2 = 25\pi \, \text{cm}^2 There are two such quarter-circle arcs, so the total area of the circular regions is: 2×25π=50πcm22 \times 25\pi = 50\pi \, \text{cm}^2

  4. Calculate the area of the shaded region: The shaded region is the area of the square minus the total area of the circular regions: Shaded area=Area of squareArea of circular regions\text{Shaded area} = \text{Area of square} - \text{Area of circular regions} Substituting the values: Shaded area=10050πcm2\text{Shaded area} = 100 - 50\pi \, \text{cm}^2 Approximating π3.14\pi \approx 3.14:

The shaded area is calculated as follows:

  1. Area of the square: The square has a side length of 10cm10 \, \text{cm}, so: [ \text{Area of square} = 10^2 = 100 , \text{cm}^2$$

  2. Area of the circular segments: There are two quarter-circles, each with a radius of 10cm10 \, \text{cm}. The area of one quarter-circle is: 14πr2=14π(10)2=25πcm2\frac{1}{4} \pi r^2 = \frac{1}{4} \pi (10)^2 = 25\pi \, \text{cm}^2 The total area of the two quarter-circles is: 2×25π=50πcm22 \times 25\pi = 50\pi \, \text{cm}^2

  3. Area of the shaded region: The shaded area is the area of the square minus the total area of the two quarter-circles: Shaded area=10050πcm2\text{Shaded area} = 100 - 50\pi \, \text{cm}^2

    Substituting π3.14\pi \approx 3.14: Shaded area10050(3.14)=100157=57cm2\text{Shaded area} \approx 100 - 50(3.14) = 100 - 157 = -57 \, \text{cm}^2

Therefore, the shaded area is approximately 57cm2-57 \, \text{cm}^2.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area of a square
Area of a circle segment

Formulas

Area of a square: side^2
Area of a quarter-circle: (1/4)πr^2

Theorems

Circle area formula
Basic area subtraction

Suitable Grade Level

Grades 6-8