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Classifying Triangles
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100
None of my sides are the same length and one angle has measure of 90 degrees. What kind of triangle am I?
right scalene
100
I am any angle that is less than 90 degrees.
an acute angle
100
Two of my angles have measure of 50 and 80. What is the third angle measure?
50 degrees
100
I am a triangle with 2 sides that are the same length
isosceles triangle
100
How many degrees do the angles in a triangle add up to?
180 degrees
200

Can a triangle have angle measures of 85, 61, and 34? Explain why or why not.

Yes, they add up to 180 degrees.

200

Angles that share a side and vertex. Draw a picture to model this.

Adjacent angles

200
An angle is 30 degrees, what is its complementary angle?
60 degrees. Complementary angles add up to 90 degrees!
200
All of my angles are less than 90 degrees
acute triangle
200

Two angles are supplementary. If one angle measures 88 degrees, what is the measure of the other angle?

92 degrees

300
I am a triangle with 1 angle greater than 90 degrees and 2 angles less than 90 degrees
an obtuse triangle
300

Angles that add up to 180 degrees. Draw a picture to model this. Label the measure of each angle.

Supplementary angles

300

Two angles in a triangle measure 50 and 65 degrees. Find the third angle. Then give a name for the triangle based on its angles.

65 degrees; acute triangle

300
I am a triangle with 3 sides that are all different lengths
scalene triangle
300
Three angles in a triangle are the same measure. What will their measure be?
60 degrees each
400

Draw an isosceles triangle. Label the measure of each angle.

Triangle must three congruent sides. Each angle should be labeled 60 degrees.

400

Angles that add up to 90 degrees. Draw a picture to model this. Label the measure of each angle.

Complementary angles.

400

An isosceles triangle has two congruent sides that are shorter than the third side. If the two shorter sides both measure 15 meters, what must be true of the longest side?

The longest side must have a measure less than 30 meters.

400

Draw two right triangles that are NOT congruent. Label the angles in each triangle that would be reasonable.

Both triangles must have one 90 degree angle. The sum of the other two angles in each triangle should be 90 degrees. (Ex: 45 & 45, 60 & 30, 75 and 15)

400
Two angles are complementary and are the same measure. What is their measure?
45 degrees
500
The angles in a triangle are 120, 50, and 10. Classify the triangle by its angle measure.
obtuse
500
Angles that are formed by intersecting lines. They are opposite and congruent.
Vertical angles.
500

I am a triangle. My angles have measure of (x - 40), (3x - 20) and 60 degrees. What is the value of x? Hint: Draw a picture, label each angle, & write an equation!

x=45 degrees

500

Draw an isosceles triangle. Label side lengths and angle measures that are reasonable.

Triangle must have two or three sides that are the same length. Angle measures must have a sum of 180. The longest side must be greater than the sum of the 2 shorter sides.

500

Brandon draws an isosceles triangle that has one 160 angle. What is the measurement of each of the other two angles in the triangle?

180 - 160 = 20 20 / 2 = 10 Each angle is 10 degrees