Final answer:
To calculate the perimeter of a composite figure with circular and rectangular elements, apply the formula 2πr for the circle part and add the lengths of all straight sides. Use 3.14 as an approximation for π, and ensure your final answer has the correct units and significant figures.
Step-by-step explanation:
To find the perimeter of the composite figure, we need to add the lengths of all the sides together. If the composite figure includes a circle, the perimeter (or circumference) of the circle is given by the formula 2πr, where π is approximately 3.14. When using 3.14 as an approximation for π, multiply it by twice the radius to find the perimeter of the circle. Remember, if the shape includes straight sides, such as rectangles or squares attached to the circle, add the lengths of those sides as well. For a composite figure with both circular and rectangular components, the total perimeter would be the sum of the circumference of the circle and the perimeters of the other geometric shapes.
It's essential to consider units and significant figures when performing these calculations. If a radius or side length is given with two significant figures, round your final answer to two significant figures to maintain consistency. As for units, if you're given measurements in meters, your answer should also be in meters.
In summary, analyze the figure to identify all the components of its perimeter, use the appropriate formulas for each geometric shape involved, and combine the perimeters to get the total length around the composite figure.