Triangles: Classifying and Understanding

Test your knowledge of triangles, including how to classify them by their sides and angles, and the important property that the sum of a triangle's angles is always 180 degrees.

Mathematics mixed 8 Questions Video Quiz

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Q1 Beginner 1 pts

What is the name of a triangle with all three sides of equal length? Video Reference:
"If all three sides of a triangle are exactly the same length, then we call it an Equilateral Triangl..."

Timestamp: 2:30

Scalene Triangle Isosceles Triangle Equilateral Triangle Right Triangle

Q2 Beginner 1 pts

True or False: A triangle can have more than one right angle. Video Reference:
"Since we can't have more than one right angle in a triangle, or more than one obtuse angle, ALL the ..."

Timestamp: 3:45

True

False

Q3 Intermediate 2 pts

Which of the following is NOT a way to classify a triangle? Video Reference:
"There's two different way to classify (or organize) triangles. They can be classified by their sides..."

Timestamp: 1:30

By its sides By its angles By its area By its perimeter

Q4 Intermediate 2 pts

Which of the following statements about the angles in a triangle is true? Video Reference:
"And the important thing is that those three angle measurements, if you combine them, they will alway..."

Timestamp: 4:00

Select all correct answers

The sum of the angles is always 180 degrees An equilateral triangle has three acute angles A right triangle has one right angle and two acute angles All of the above

Q5 Advanced 3 pts

True or False: An isosceles triangle can be a right triangle. Video Reference:
"And in one special case, an isosceles triangle can also be a right triangle, like so...."

Timestamp: 3:30

True

False

Q6 Advanced 3 pts

Which of the following triangle types can have more than one obtuse angle? Video Reference:
"A scalene triangle can also be either an obtuse or an acute triangle...."

Timestamp: 3:15

Equilateral Isosceles Scalene None of the above

Q7 Intermediate 2 pts

Which of the following is NOT a way to classify a triangle by its angles? Video Reference:
"The one made from the right angle is called a Right Triangle. The one made from the acute angle is c..."

Timestamp: 2:00

Select all correct answers

Right Triangle Acute Triangle Obtuse Triangle Equilateral Triangle

Q8 Intermediate 2 pts

If two angles of a triangle are known to be 35 degrees and 45 degrees, what is the measure of the third angle? Video Reference:
"Since we know that the total must be 180 degrees, we can just add up the angles that we DO know, and..."

Timestamp: 4:30

50 degrees 80 degrees 100 degrees 120 degrees

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Triangles: Classifying and Understanding

What is the name of a triangle with all three sides of equal length? Video Reference: "If all three sides of a triangle are exactly the same length, then we call it an Equilateral Triangl..." Timestamp: 2:30

True or False: A triangle can have more than one right angle. Video Reference: "Since we can't have more than one right angle in a triangle, or more than one obtuse angle, ALL the ..." Timestamp: 3:45

Which of the following is NOT a way to classify a triangle? Video Reference: "There's two different way to classify (or organize) triangles. They can be classified by their sides..." Timestamp: 1:30

Which of the following statements about the angles in a triangle is true? Video Reference: "And the important thing is that those three angle measurements, if you combine them, they will alway..." Timestamp: 4:00

True or False: An isosceles triangle can be a right triangle. Video Reference: "And in one special case, an isosceles triangle can also be a right triangle, like so...." Timestamp: 3:30

Which of the following triangle types can have more than one obtuse angle? Video Reference: "A scalene triangle can also be either an obtuse or an acute triangle...." Timestamp: 3:15

Which of the following is NOT a way to classify a triangle by its angles? Video Reference: "The one made from the right angle is called a Right Triangle. The one made from the acute angle is c..." Timestamp: 2:00

If two angles of a triangle are known to be 35 degrees and 45 degrees, what is the measure of the third angle? Video Reference: "Since we know that the total must be 180 degrees, we can just add up the angles that we DO know, and..." Timestamp: 4:30