Triangles
None of my sides are the same length and one angle has measure of 90 degrees. What kind of triangle am I?
right scalene
I am any angle that is less than 90 degrees.
an acute angle
Two of the angles within a triangle have measures of 50 and 80. What is the third angle measure?
50 degrees
I am a triangle with 2 sides that are the same length
isosceles triangle
How many degrees do the angles in a triangle add up to?
180 degrees
Can a triangle have angle measures of 87, 61, and 34?
No, they do not add up to 180 degrees.
Angles that share a side and vertex.
Adjacent angles.
An angle is 30 degrees, what is its complementary angle?
60 degrees. Complementary angles add up to 90 degrees!
All of my angles are less than 90 degrees
acute triangle
Find the supplementary angle to 100.
80 degrees
I am a triangle with 1 angle greater than 90 degrees and 2 angles less than 90 degrees
an obtuse triangle
Angles that add up to 180 degrees.
Supplementary angles
Two angles in a triangle are 50 and 65. Find the third angle.
65 degrees
I am a triangle with 3 sides that are all different lengths
scalene triangle
Three angles in a triangle are the same measure. What will their measure be?
60 degrees each
Draw an isosceles triangle.
(two sides are congruent)
Angles that add up to 90 degrees.
Complementary angles.
A right triangle has one angle that is 30 degrees? Find the third angle.
60 degrees
Draw a right triangle
(See student work)
Two angles are complementary and are the same measure. What is their measure?
45 degrees
The angles in a triangle are 120, 50, and 10. Classify the triangle by its angle measure.
obtuse
Angles that are formed by intersecting lines. They are opposite and congruent.
Vertical angles.
An angle measures 148 degrees. What is its supplementary angle?
The supplementary angle to 148 degrees is 32 degrees.
Draw an isosceles triangle
(See student work)
Brandon draws a 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