Calculating Areas of Shapes

The video tutorial explains how to calculate the area of a composite figure consisting of a rectangle and half a circle. It covers the formulas for calculating the area of a rectangle (length times width) and a circle (pi times radius squared), and how to adjust for half a circle. The tutorial demonstrates combining these areas to find the total area, providing both exact and approximate values. It also discusses the impact of using approximate values for pi, such as 3.14, on the accuracy of the area calculation.

What is the first step in solving the problem of finding the area of the given figure?

• Determine the area of the rectangle.

• Calculate the perimeter of the rectangle.

• Find the circumference of the circle.

• Measure the diagonal of the rectangle.

Which formula is used to calculate the area of a rectangle?

• Area = length plus width

• Area = length times width

• Area = 2 times length plus 2 times width

• Area = pi times radius squared

What is the radius of the half circle if the segment length is 10 meters?

• 10 meters

• 7.5 meters

• 2.5 meters

• 5 meters

How do you calculate the area of half a circle?

• Area = pi times diameter divided by two

• Area = pi times diameter squared

• Area = pi times radius squared

• Area = pi times radius squared divided by two

What is the exact area of the figure in terms of pi?

• 120 + 25 pi/2

• 120 + 50 pi

• 120 + 25 pi

• 120 + 50 pi/2

What is the approximate area of the figure using the pi key on a calculator?

• 159.25 square meters

• 158.00 square meters

• 159.27 square meters

• 160.00 square meters

Why might you be asked to use 3.14 or 22/7 for pi in calculations?

• To make calculations faster

• To avoid using a calculator

• To simplify calculations

• To increase accuracy

How does using 3.14 for pi affect the area calculation?

• It has no effect

• It affects the accuracy

• It makes the area smaller

• It makes the area larger

What is the approximate area of the figure when using 3.14 for pi?

• 160.00 square meters

• 159.27 square meters

• 158.00 square meters

• 159.25 square meters

What should you be careful about when performing calculations with pi?

• Using the correct units

• Reading the directions carefully

• Using the correct formula

• Measuring accurately