Area of Triangles

The video tutorial explains how to determine the height and base of a triangle, emphasizing that the height must meet the base at a 90-degree angle. It uses a triangle with sides of 9, 6, and 10 inches, identifying the 10-inch side as the base and a 5-inch line as the height. The tutorial then demonstrates calculating the triangle's area using the formula (base * height) / 2, resulting in an area of 25 square inches. The lesson concludes by reinforcing the importance of using square units for area measurements.

What is the requirement for a line to be considered the height of a geometrical figure?

• It must be the longest side of the figure.

• It must be equal in length to the base.

• It must meet the base at a 90-degree angle.

• It must be parallel to the base.

In the given triangle, which side is identified as the base?

• The side measuring 9 inches.

• The side measuring 6 inches.

• The side measuring 10 inches.

• The side measuring 5 inches.

What formula is used to calculate the area of a triangle?

• Base minus height divided by 2

• Base times height divided by 2

• Base plus height divided by 2

• Base times height divided by 3

If the base of a triangle is 10 inches and the height is 5 inches, what is the area?

• 30 square inches

• 35 square inches

• 25 square inches

• 20 square inches

Why is it important to include square units when labeling the area of a triangle?

• To show the measurement is in three dimensions.

• To indicate the measurement is in two dimensions.

• To ensure the units match the base and height.

• To differentiate from perimeter measurements.