Geometry Vocabulary
Angle Relationships
Triangles and Their Properties
Right Triangles and the Pythagorean Theorem
Similar Triangles
100
What are shapes with four sides called?
Quadrilaterals
100
What is the sum of two angles that form a straight line?
180 degrees
100
What is the sum of the interior angles of any triangle?
180 degrees
100
The Pythagorean Theorem only works for … triangles.
Right Triangles
100
What does it mean for two shapes to be similar?
They have the same shape but not necessarily the same size.
The corresponding angles congruent and the corresponding sides are proportional.
200
What are two angles that add up to 90 degrees called?
Complementary Angles
200
If two parallel lines are cut by a transversal, what angles are always congruent?
Corresponding angles
200
A triangle has sides of lengths 3 cm, 4 cm, and 5 cm. What type of triangle is it?
A right triangle.
200
In the Pythagorean Theorem formula, c is always the …
Hypotenuse
200
Triangle PQR is similar to triangle XYZ. What is the measure of angle Y?
angle Y = 70 degrees
300
A triangle with at least two equal sides is called …
Isosceles triangle
300
Two angles are supplementary. If the measure of one angle is 49 degrees, what is the measure of the other angle?
131 degrees
300
What are three types of triangles if we classify them by their sides?
Equilateral, Isosceles, Scalene
300
A right triangle has two legs measuring 6 m and 8m. What is the length of the hypotenuse?
10 m
300
Triangle ABC is similar to triangle DEF. What is x, the length of side EF?
x = 12 cm
400
The longest side of a right triangle is called the …
Hypotenuse
400
In a triangle, one angle measures 68 degrees and another angle measures 47 degrees. What is the measure of the third angle?
65 degrees
400
A triangle has angles of 30 degrees and 55 degrees. What type of triangle is it?
An obtuse triangle.
400
A right triangle has a hypotenuse that is 13 cm. If one of the legs is 12 cm, what is the length of the other leg?
5 cm
400
Triangle ABC is similar to triangle DEF. What is x, the length of side DF?
x = 14
500
Angles that are next to one another and share a common vertex are called …
Adjacent Angles
500
Two supplementary angles are in a ratio of 2:1. Find the measures of both angles.
120 degrees and 60 degrees
500
The exterior angle of a triangle is 145 degrees. If one of the alternate interior angles is 80 degrees, what is the measure of the other alternate interior angle?
65 degrees
500
A baseball diamond is a square with sides of 90 feet. What is the distance from home plate to second base? Round to the nearest foot.
127 feet
500
Triangle ABC is similar to triangle DEF. Find x, the length of side DE.
x = 12
