OpenUp 8th Math 1.15 Practice Problems and Vocab

A ___ angle is an angle that forms a straight line. It measures 180 degrees.

In triangle ABC , the measure of angle A is 40 degrees. Which of the following could be possible measure of angles B and C if the triangle is isosceles?

• both are 70 degrees

• both are 45 degrees

• B is 40 degrees and C is 100 degrees

• C is 40 degrees and B is 100 degrees

In triangle ABC , the measure of angle A is 40 degrees. Which of the following could be possible measure of angles B and C if the triangle is right?

• both are 70 degrees

• both are 45 degrees

• B is 50 degrees and C is 90 degrees

• C is 50 degrees and B is 90 degrees

True or False: A triangle can have angle measure of 60 degrees, 60 degrees, and 60 degrees.

• true

• false

True or False: A triangle can have angle measure of 90 degrees, 90 degrees, and 45 degrees.

• true

• false

True or False: A triangle can have angle measure of 30 degrees, 40 degrees, and 50 degrees.

• true

• false

True or False: A triangle can have angle measure of 90 degrees, 45 degrees, and 45 degrees.

• true

• false

True or False: A triangle can have angle measure of 120 degrees, 30 degrees, and 30 degrees.

• true

• false

Angle A in triangle ABC is obtuse. Can angle B or angle C be obtuse?

• both can obtuse

• neither can be obtuse

• only one can be obtuse

What type of transformation?

• translation

• reflection

• rotation

• none