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# Triangles and Angles

This Math quiz is called 'Triangles and Angles' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

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A triangle is a geometric form created by connecting three straight lines. Where each line connects or intersects you get an angle. A triangle will have three angles.

1.
What is Angle C of a triangle if Angle A is 67° and Angle B is 59°?
126°
54°
113°
121°
67° + 59° = 126°
180° - 126° = 54°
67 + 59 + 54 = 180°
Angle C is 54° so Answer (b) is correct
2.
If Angle A is 72° and Angle B is 33°, what type of an angle would Angle C be in a triangle?
Right
Straight
Obtuse
Acute
72° + 33° = 105°
180° - 105° = 75°
Angle C is 75° and because it is less than 90° it is an acute angle. Answer (d) is the correct answer
3.
If Angle A is 68° and Angle B is 22°, what type of an angle would Angle C be?
Acute
Right
Straight
Obtuse
68° + 22° = 90°
180° - 90° = 90°
Angle C is 90° making it a right angle so Answer (b) is the correct answer
4.
If Angle A is 49° and Angle B is 27°, what type of an angle would Angle C be?
Obtuse
Right
Acute
Straight
49° + 27° = 76°
180° - 76° = 104°
Angle C is 104° and because it is greater than 90° it is an obtuse. Answer (a) is the correct answer
5.
What type of a triangle do you have if Angle A is 56°, Angle B is 111°, and Angle C is 13°?
Straight
Right
Acute
Obtuse
When at least one angle is more than 90°, it is an obtuse triangle. Answer (d) is correct
6.
What is Angle C if Angle A is 33° and Angle B is 17°?
147°
163°
50°
130°
33° + 17° = 50°
180° - 50° = 130°
7.
If Angle A is 60° and Angle B is 45°, what type of an angle would Angle C be?
Straight
Obtuse
Acute
Right
60° + 45° = 105°
180° - 105° = 75°
Angle C is 75° and because it is less than 90° it makes it an acute angle. Answer (c) is the correct answer
8.
What type of a triangle do you have if Angle A is 28°, Angle B is 62°, and Angle C is 90°?
Right
Acute
Obtuse
Straight
When at least one angle measures exactly 90°, it is a right triangle. Answer (a) is correct
9.
What type of triangle do you have if Angle A is 13°, Angle B is 45°, and Angle C is 122°?
Straight
Obtuse
Right
Acute
When at least one angle is more than 90°, it is an obtuse triangle. Answer (b) is correct
10.
What type of a triangle do you have if Angle A is 77°, Angle B is 82°, and Angle C is 21°?
Acute
Right
Obtuse
Straight
When all three angles are less than 90°, it is an acute triangle. Answer (a) is correct
Author:  Christine G. Broome