Calculating Perimeter and Circumference

The video tutorial explains how to calculate the perimeter of a composite figure consisting of a rectangle and a semicircle. It covers the use of formulas for the circumference of a circle and the addition of side lengths of the rectangle. The tutorial emphasizes the importance of using accurate values for pi to minimize errors in calculations and demonstrates how to use a calculator for decimal approximations.

What is the perimeter of a figure?

• The area inside the figure

• The diagonal length of the figure

• The distance around the outside of the figure

• The volume of the figure

Which formula is used to calculate the circumference of a circle when the diameter is known?

• 2 times pi times diameter

• pi times diameter

• 2 times pi times radius

• pi times radius

What is the length of the diameter of the circle in the problem?

• 30 centimeters

• 11 centimeters

• 22 centimeters

• 15 centimeters

How do you calculate the perimeter of the given figure?

• Add the area of the rectangle and the circle

• Add the lengths of the rectangle sides and half the circumference of the circle

• Multiply the lengths of the rectangle sides and the circumference of the circle

• Subtract the area of the circle from the rectangle

What is the total length of the three rectangle sides in the problem?

• 41 centimeters

• 26 centimeters

• 30 centimeters

• 45 centimeters

Why is it important to use the pi key on a calculator?

• It simplifies the formula

• It provides a more accurate calculation

• It is faster than manual calculation

• It is required by all math problems

What is the approximate perimeter of the figure when using the pi key?

• 41 centimeters

• 58.28 centimeters

• 30 centimeters

• 11 centimeters

What happens if you round pi before performing calculations?

• The result is always larger

• The result is less accurate

• The result is more accurate

• The result is unchanged

What value is often used for pi in specific problems?

• 3.14

• 3.1416

• 3.14159

• 3.141

Why is it important to read the directions carefully when using pi for calculations?

• To use the correct units

• To save time during calculations

• To avoid errors in the final result

• To ensure the correct formula is used