 Name: ___________________Date:___________________

 Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

### Grade 6 - Mathematics9.19 Classifying Triangles by Angles

#### Classification of triangles based on angles

1. Acute angled triangle:

• If all the angles of a triangle are acute angles, then it is called an acute angled triangle.

• 2. Right angled triangle:
• A triangle in which one of the angles is a right angle is called a right angled triangle.

• In a right angled triangle, the side opposite to the right angle is called its hypotenuse.

•  3. Obtuse angled triangle:
• A triangle containing an obtuse angle is called an obtuse angled triangle.

• Directions: Read the above properties of triangles and answer the following questions:
1. Illustrate each of the above properties by drawing a triangle.
2. Write in your own words, how to classify triangles according to their angles.

 Q 1: If the angles of a triangle are given by 100 degrees, 30 degrees and 50 degrees, then the triangle is an right angled triangle.TrueFalse Q 2: The angles 30 degrees, 60 degrees and 90 degrees represents a (an) ________ angled triangle.Answer: Q 3: If, in a triangle, 70 degrees, 55 degrees and 55 degrees represents its angles, then the triangle is a (an) ________.Obtuse angled isosceles triangleRight angled isosceles triangleAcute angled isosceles triangle Q 4: A triangle whose angles are given by 75 degrees, 45 degrees and 60 degrees is a (an) ________ angled triangle.Answer: Q 5: The angles 90 degrees, 45 degrees and 45 degrees represents a (an) ________ triangle.Acute angled isoscelesRight angled isoscelesObtuse angled scalene Q 6: The side opposite to the right angle in a right angled triangle is called the ________ of the triangle.Answer: Q 7: The angles 90 degrees, 30 degrees and 60 degrees represents an obtuse angled triangle.FalseTrue Q 8: In a triangle the angles are given by 55 degrees, 25 degrees and 100 degrees. The triangle is a (an) ________.Right angled scalene triangleAcute angled scalene triangleObtuse angled scalene triangle Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

#### Subscription to kwizNET Learning System costs less than \$1 per month & offers the following benefits:

• Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
• Instant scoring of online quizzes
• Progress tracking and award certificates to keep your student motivated
• Unlimited practice with auto-generated 'WIZ MATH' quizzes