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Triangle Angles
Finding Angles
Conjectures
Congruence Shortcuts
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100
This triangle has two congruent base angles
What is an isosceles triangle?
100
Two angles in a triangle are each 60 degrees. What is the measure of the third angle?
What is 60 degrees?
100
Fill in the conjecture. In a triangle, the longest side is _________________________ the largest angle.
What is opposite or across?
100

This triangle congruence shortcut is specific to right triangles. 

What is HL? 

100

CPCTC is an acronym for this very important phrase. 

What is corresponding parts of congruent triangles are congruent?

200
This triangle has all angles less than 90 degrees
What is an acute triangle?
200
Two angles in a triangle measure 42 degrees and 101 degrees. What is the measure of the third angle?
What is 37 degrees?
200
Fill in the conjecture. The measure of the two smallest sides of a triangle must be __________________ than the third side.
What is greater?
200

If triangle ABC is congruent to triangle DEF, then segment AC will be congruent to this segment. 

What is segment DF? 

200
In a proof, what property allows us to say a side is congruent to itself?
What is the reflexive property?
300

This triangle has one angle greater than 90 degrees?

What is an obtuse triangle?

300
Three angles in a triangle are 30, 60, and x + 45. Solve for x.
What is x = 45?
300
Fill in the conjecture. The measure of an exterior angle of a triangle is equal to the sum of the _________ ________________ _________________.
What is two remote (interior) angles?
300

These are two combinations of sides and angles that cannot guarantee congruence in triangles.

What are AAA and SSA? 

300
If the exterior angle is 110 degrees, and the two remote interior angles are 30 and 2x. Find x.
What is x = 40
400

This type of triangle is neither acute nor obtuse. 

What is a right triangle?

400
Three angles in a triangle are 20, 40, and 2x - 4, find x.
What is x= 62?
400

Fill in the conjecture. If a triangle is isosceles, then _________ ________________ are congruent. Hint: Not the sides.

What are base angles?

400

These are the triangle congruence shortcuts. 

What are SSS, SAS, AAS, ASA, and HL? 

400

Numbers of the type 2,3,5,7,11 etc. are known as this. 

What are prime numbers

500

The angles in a pentagon sum to this measure

What is 540 degrees?

500
Three angles in a triangle measure 3x, 10x, 5x. Find x.
What is x = 10?
500

If a triangle has two congruent base angles, then it must be one of these two types of triangles.

What is isosceles or equilateral.

500

In triangle XYZ, the measures of the angles are 30, 29, and 121, respectively. Triangle DEF is congruent to triangle YZX, so this would be the measure of angle E.

What is 121? 

500

This word comes from the word hundrath, which means 120.

What hundredth.