Triangle Angles and Properties

The video tutorial explains the properties of isosceles triangles, emphasizing that the two equal sides result in equal opposite angles. It guides viewers through calculating unknown angles in triangles, using the total sum of angles in a triangle (180 degrees) and the properties of straight lines. The tutorial also covers solving for unknown angles in various triangle configurations, reinforcing the concept of congruent angles and the importance of not assuming angles without visual confirmation.

What is the defining property of an isosceles triangle?

• It has a right angle.

• Two sides are equal.

• All three sides are equal.

• All angles are equal.

If one angle in an isosceles triangle is 118 degrees, what is the sum of the other two angles?

• 31 degrees each

• 62 degrees each

• 118 degrees

• 62 degrees

How do you calculate the remaining angles if one angle in an isosceles triangle is given?

• Multiply the given angle by 2.

• Subtract the given angle from 180 and divide by 2.

• Add the given angle to 180 and divide by 2.

• Subtract the given angle from 90 and divide by 2.

What is the measure of each of the two equal angles if the third angle is 118 degrees?

• 118 degrees

• 59 degrees

• 62 degrees

• 31 degrees

What is the total degree measure of a straight line?

• 360 degrees

• 45 degrees

• 180 degrees

• 90 degrees

If one angle on a straight line is 118 degrees, what is the measure of the other angle?

• 90 degrees

• 31 degrees

• 118 degrees

• 62 degrees

What type of triangle is formed if two sides are equal and one angle is 62 degrees?

• Scalene triangle

• Equilateral triangle

• Isosceles triangle

• Right triangle

How do you verify if the calculated angles in a triangle are correct?

• Check if the sum of all angles equals 360 degrees.

• Check if the sum of all angles equals 180 degrees.

• Check if the sum of all angles equals 270 degrees.

• Check if the sum of all angles equals 90 degrees.

What is the measure of the third angle if the other two angles are 62 degrees each?

• 56 degrees

• 62 degrees

• 31 degrees

• 118 degrees

What is the sum of the angles in any triangle?

• 90 degrees

• 270 degrees

• 180 degrees

• 360 degrees