Perimeter and Area: Area and Triangles

The video tutorial begins by asking viewers to identify the shape of a piece of cake, which is revealed to be a triangle. It explains that triangles are three-sided geometric figures and introduces two types: isosceles triangles, with at least two equal sides, and right triangles, with a 90-degree angle. The tutorial then discusses how to calculate the area of a triangle, using the formula: area equals 1/2 base times height. An example is provided, measuring a triangle with a base of 6 cm and a height of 10 cm, resulting in an area of 30 cm squared.

What is a characteristic of an isosceles triangle?

• It has no equal sides.

• It has a 90-degree angle.

• It has at least two sides of equal length.

• It has all sides of different lengths.

Which type of triangle includes a 90-degree angle?

• Equilateral triangle

• Isosceles triangle

• Scalene triangle

• Right triangle

How is the area of a triangle related to the area of a parallelogram?

• It is one-third the area of a parallelogram.

• It is the same as the area of a parallelogram.

• It is half the area of a parallelogram.

• It is twice the area of a parallelogram.

What is the formula for calculating the area of a triangle?

• Area = 1/2 base times height

• Area = base minus height

• Area = base times height

• Area = base plus height

If a triangle has a base of 6 cm and a height of 10 cm, what is its area?

• 60 cm squared

• 30 cm squared

• 15 cm squared

• 45 cm squared