1. Word cloud

120 seconds

Name the three sides of a triangle.

2. Slide

60 seconds

"Classify triangles based on sides and angles."

Learning objective:

3. Slide

60 seconds

Triangles are 3-sided polygons with 3 interior angles adding to 180°. They can be classified by their side length and angle measurements as equilateral, isosceles, or scalene. The sum of the lengths of two sides of a triangle must be greater than the length of the third side.

Triangles: A Look at Their Properties

4. Slide

60 seconds

A triangle is a polygon with three sides and three angles. The angles of a triangle always add up to 180 degrees. The three sides of a triangle are known as the base, the height, and the hypotenuse. The hypotenuse is the longest side of a triangle, and it is opposite the right angle. The three types of triangles are scalene, isosceles, and equilateral. A scalene triangle has no sides that are equal, an isosceles triangle has two sides that are equal, and an equilateral triangle has all three sides equal.

Concepts:

5. Slide

60 seconds

The sum of the three angles of any triangle is always 180 degrees. The longest side of a triangle is always opposite the greatest angle. There are many types of triangles: equilateral, isosceles, scalene, right triangle, and obtuse triangle.

Did you know?

6. Slide

60 seconds

Angle Sizes

7. Slide

60 seconds

Triangles

8. Open question

180 seconds

Work together in pairs: Which of the following is an example of an equilateral triangle?A) a triangle with three congruent sides and three congruent anglesB) a triangle with three congruent sides and two congruent anglesC) a triangle with three congruent angles and two unequal sidesD) a triangle with three unequal sides and three congruent angles

9. Open question

180 seconds

Work together in pairs: What are the three main types of triangles and what do they have in common?

10. Drawings

450 seconds

Brain break: Draw a dinosaur playing soccer with a flamingo.

11. Poll

60 seconds

What is the sum of the angles in a triangle?

- 180 degrees
- 90 degrees
- 360 degrees

12. Poll

60 seconds

What do you call a triangle with three equal sides?

- Equilateral Triangle
- Isosceles Triangle
- Scalene Triangle

13. Poll

60 seconds

What is the longest side of a right-angled triangle called?

- Hypotenuse
- Adjacent Side
- Opposite Side

14. Poll

60 seconds

What do you call a triangle with only one angle greater than 90 degrees?

- Obtuse Triangle
- Acute Triangle
- Right-AngledTriangle

15. Poll

60 seconds

If an equilateral triangle has a perimeter of 12cm, what is the length of each side?

- 4 cm
- 3 cm
- 2 cm

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