This type of angle is designated by a small square at the vertex.
90o
What is the measure of angle 7?
114o
180o
What is the sum of the interior angles of a quadrilateral?
360o
What does similar mean?
Same shape, different size
This type of angle is greater than 90o.
Obtuse
What is the measure of angle 2?
114o
A triangle has angles that measure 30o and 50o. What is the measure of its third angle?
100o
What is the sum of the interior angles of a pentagon?
540o
Triangle ABC has angle measures of 13o, 65o, and xo.
Triangle DEF has angle measures of 102o, 13o, and yo.
Are they similar?
Yes!
This type of angle is less than 90o.
Acute
What type of relationship do angles 1 and 8 have?
Alternating exterior angles
A triangle has angles that measure 27o and 81o. What is the measure of its third angle?
72o
What is the sum of the interior angles of a hexagon?
720o
Triangle ABC is dilated by a scale factor of 1/2 to create Triangle A'B'C'. Are the two triangles similar or congruent?
Similar
This pair of angles has a sum of 90o.
Complementary angles
What type of relationship do angles 4 and 5 have?
Alternating interior angles
A triangle has angles that measure xo, (x + 12)o, and 50o. What are its three interior angles?
59o, 71o, and 50o
What is the sum of the interior angles of a decagon?
1440o
Triangle ABC has a base of 3 ft and a height of 5 ft. Triangle DEF is similar to Triangle ABC and has a base of 4.5 feet. What is the height of Triangle DEF?
7.5 feet
This pair of angles has a sum of 180o.
Supplementary angles
Name all the angle numbers that measure 114o.
Angles 2, 3, and 7.
Triangle ABC is a right isosceles triangle. What are its three angle measures?
90o, 45o, and 45o
What is the measure of each interior angle of a regular octagon?
135o
Triangle ABC has a base of 6 ft and a height of 3 ft. Triangle DEF is similar to Triangle ABC and has a base of 4 feet. What is the height of Triangle DEF?
2 feet