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Angles
Triangles & Quadrilaterals
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100
This kind of angle measures less than 180 degrees but more than 90 degrees.
Obtuse angle
100
This is a quadrilateral with two sets of parallel sides
A parallelogram
100

3 shots

congrats

200
This angle is less than 90 degrees.
Acute angle
200
This is a quadrilateral with only one pair of parallel sides.
A trapezoid
200

Angle ABC measures 120°. Ray BD bisects ∠ABC. Ray BE bisects ∠DBC. What is the measure of ∠EBC?

30°

300
These angles have measures of exactly 90 degrees.
Right angles
300
This type of triangle has all angles and sides congruent.
Equilateral triangle
300

The measure of ∠M is 57°. What is the measure of its complementary angle?

33°

400
What are two lines that intersect and form a right angle called?
Perpendicular lines
400

5 shots 

congrats

400

The lengths of two sides of a triangle are 3 cm and 7 cm. What can you conclude about the maximum length of the third side of the triangle?

It must be less than 10 cm.

500
The sum of the measure of the angles of a _________ always equal 180 degrees.
Triangle, straight line, or supplementary angle set
500

A type of triangle in which all the three internal angles of the triangle are less than 90 degrees. 

Acute triangle

500

Determine the measures of these angles. (Angle A + B are supplementary and linear angles). 

Angle A - (9x + 4) ° 

Angle B - (2x) ° 

The angle measures are A=148° and B=32°