Geometry: Squares, Triangles, and Polygons

The video tutorial explains the properties of an equilateral triangle and a square, both part of a polygon ABCDE. The square has an area of 1, leading to each side being 1 unit long. The equilateral triangle shares sides with the square, making each side of the triangle also 1 unit long. The tutorial guides viewers through calculating the perimeter of the polygon ABCDE, which is a five-sided figure with each side measuring 1 unit, resulting in a total perimeter of 5 units.

What type of triangle is CDE in the figure?

• Right-angled

• Scalene

• Isosceles

• Equilateral

What is the area of the square ABCE?

• 2

• 1

• 0.5

• 4

If ABCE is a square with an area of 1, what is the length of each side?

• 0.5

• 1

• 2

• 4

How many sides does the polygon ABCDE have?

• 5

• 3

• 6

• 4

What is the length of each side of the equilateral triangle CDE?

• 3

• 1

• 0.5

• 2

What is the perimeter of the polygon ABCDE?

• 4

• 6

• 5

• 3