Math Problem Statement
Solution
Let’s analyze the problem and solve it step by step.
Problem Description:
- The shape is a combination of a rectangle and three-quarters of a circle.
- The rectangle's dimensions are 4 m (length) and 3 m (height).
- The circle's radius is 2 m, and the circle is positioned so that three-quarters of its perimeter forms part of the shape.
We are tasked with finding the perimeter of the shape to two decimal places, and π is approximated as 3.14.
Solution:
Step 1: Perimeter of the rectangle
The perimeter of the rectangle includes:
- Two full sides (3 m and 4 m), and
- Two other sides, where part of the circle replaces one corner.
Thus, the linear part of the rectangle in the perimeter is:
Step 2: Three-quarters of the circle's circumference
The circle's radius is . The circumference of the full circle is:
Since only three-quarters of the circle is part of the perimeter, we calculate:
Step 3: Total Perimeter
The total perimeter is the sum of the linear part of the rectangle and the three-quarters of the circle:
Final Answer:
The perimeter of the shape is:
Let me know if you'd like more details or have further questions. Below are some related questions to expand your understanding:
- How would the perimeter change if the circle were a full circle instead of three-quarters?
- How is the area of the shape calculated?
- What if the rectangle’s dimensions were different? How would that affect the perimeter?
- What happens to the calculation if π is used as 3.14159 instead of 3.14?
- How do you calculate the arc length for any fraction of a circle?
Tip: Always break down composite shapes into their basic components to simplify calculations.
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Math Problem Analysis
Mathematical Concepts
Geometry
Perimeter of composite shapes
Circle properties
Arc length calculation
Formulas
Perimeter of a rectangle = 2(length + width)
Circumference of a circle = 2πr
Arc length of a circle = (θ/360) × 2πr
Theorems
Properties of circles
Relationship between arc length and central angle
Suitable Grade Level
Grades 8-10
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