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
Made with ❤️ from Norway