This lesson explores the properties of triangles, focusing on scalene, isosceles, and equilateral types. It examines the relationships between side lengths and angles, including acute, right, and obtuse angles. The lesson emphasizes the concept that the sum of angles in a triangle is always 180 degrees. A detailed exploration of isosceles right triangles is provided, highlighting how changes in side lengths affect angle sizes.

What is the main goal of the warm-up activity in the lesson?

• To identify patterns in triangles

• To calculate the area of triangles

• To draw perfect triangles

• To memorize triangle formulas

Which type of triangle has all sides of different lengths?

• Right

• Equilateral

• Isosceles

• Scalene

What is a characteristic of an equilateral triangle?

• All sides and angles are equal

• All sides are different lengths

• All angles are 90 degrees

• It has one obtuse angle

Which type of triangle has one angle exactly 90 degrees?

• Obtuse

• Right

• Acute

• Equilateral

In an isosceles triangle, if two sides are equal, what can be said about the angles?

• Two angles are equal

• All angles are different

• One angle is obtuse

• All angles are 90 degrees

What happens to the angles in an isosceles right triangle as one side length increases?

• The angles remain the same

• The angles adjust to maintain congruency

• The angles become acute

• The angles become obtuse

How do the angles in an isosceles right triangle relate to each other?

• They are all 60 degrees

• They are all different

• Two angles are 45 degrees each

• One angle is 90 degrees, others are 60 degrees

What is the significance of the diagonal in a square related to isosceles right triangles?

• It divides the square into two obtuse triangles

• It helps determine a 45-degree angle

• It represents a 90-degree angle

• It is irrelevant

What happens to the angles as the side length of an isosceles right triangle increases?

• They remain constant

• They approach 45 degrees

• They become larger than 90 degrees

• They become equal to 60 degrees

What is the relationship between the angles in an isosceles right triangle?

• They are all equal

• They add up to 180 degrees

• They add up to 90 degrees

• They are all different