Exploring Types of Triangles

The video tutorial covers the classification of triangles by angles and sides, including acute, right, and obtuse triangles, as well as scalene, isosceles, and equilateral triangles. It also explains the triangle sum theorem, which states that the sum of the angles in any triangle is always 180 degrees. The tutorial includes examples and calculations to find missing angles using this theorem.

What type of triangle has all angles less than 90 degrees?

• Scalene triangle

• Obtuse triangle

• Acute triangle

• Right triangle

Tags

CCSS.4.G.A.2

What do we call a triangle with one angle exactly 90 degrees?

• Acute triangle

• Isosceles triangle

• Equilateral triangle

• Right triangle

Tags

CCSS.4.G.A.2

Which triangle has sides of different lengths?

• Scalene triangle

• Acute triangle

• Isosceles triangle

• Equilateral triangle

Tags

CCSS.4.G.A.2

What is the name of a triangle with two equal sides?

• Scalene triangle

• Right triangle

• Isosceles triangle

• Equilateral triangle

Tags

CCSS.4.G.A.2

Which triangle has all sides of the same length?

• Isosceles triangle

• Scalene triangle

• Equilateral triangle

• Right triangle

Tags

CCSS.4.G.A.2

According to the Triangle Sum Theorem, what is the sum of the angles in any triangle?

• 360 degrees

• 180 degrees

• 270 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

If two angles in a triangle are 83 and 71 degrees, what is the third angle?

• 24 degrees

• 26 degrees

• 28 degrees

• 30 degrees

Tags

CCSS.8.G.A.5

In a triangle, if the angles are represented by 7x + 3, 78, and 64 degrees, what is the value of x?

• 8

• 7

• 6

• 5

Tags

CCSS.8.G.A.5

What is the missing angle if x = 5 and the angles are 7x + 3, 78, and 64 degrees?

• 38 degrees

• 42 degrees

• 45 degrees

• 40 degrees

Tags

CCSS.7.G.B.5

If a triangle has angles 7x + 3, 78, and 64 degrees, and x is 5, what is the sum of the angles?

• 190 degrees

• 180 degrees

• 175 degrees

• 185 degrees

Tags

CCSS.8.G.A.5