Triangle Angles and Properties

Miss Lee explains the triangle angle sum property, which states that the sum of angles in a triangle is always 180 degrees. She demonstrates how to find missing angles using this property through various examples, including right angles and congruent angles. The lesson also covers equilateral triangles, where all sides and angles are equal.

What is the sum of the angles in any triangle?

• 360 degrees

• 90 degrees

• 270 degrees

• 180 degrees

If two angles in a triangle are 49 degrees and 47 degrees, what is the measure of the third angle?

• 104 degrees

• 94 degrees

• 74 degrees

• 84 degrees

In a triangle, if one angle is 37 degrees and another is 84 degrees, what is the measure of the third angle?

• 89 degrees

• 79 degrees

• 69 degrees

• 59 degrees

What does a small box symbol in an angle indicate?

• Acute angle

• Obtuse angle

• Right angle

• Straight angle

If a triangle has one right angle and another angle of 22 degrees, what is the measure of the third angle?

• 58 degrees

• 88 degrees

• 78 degrees

• 68 degrees

What does it mean if two sides of a triangle have the same number of tick marks?

• They are unequal

• They are parallel

• They are perpendicular

• They are congruent

In a triangle with two congruent sides, if one angle is 65 degrees, what is the measure of the other congruent angle?

• 85 degrees

• 55 degrees

• 65 degrees

• 75 degrees

What is true about the sides and angles of an equilateral triangle?

• Only two sides are equal

• All sides are different

• All angles are different

• All sides and angles are equal

If one angle in an equilateral triangle is 60 degrees, what are the measures of the other two angles?

• 80 degrees each

• 70 degrees each

• 90 degrees each

• 60 degrees each

How can you verify that a triangle is equilateral?

• Check if one angle is 180 degrees

• Check if all sides are equal

• Check if all angles are 90 degrees

• Check if two sides are equal