Geometry Midterm Vocab

Question 1

triangle with 3 angles less than 90°

Answer 1

Acute Triangle -

Question 2

exterior angles, non-adjacent, and on opposite sides of the
transversal

Answer 2

Alternate Exterior Angles -

Question 3

interior angles, non-adjacent, and on opposite sides of the transversal

Answer 3

Alternate Interior Angles -

Question 4

formed by two rays with a common endpoint

Answer 4

Angle -

Question 5

a ray that divides an angle into two congruent angles

Answer 5

Angle Bisector -

Question 6

corresponding parts of congruent triangles are congruent

Answer 6

CPCTC -

Question 7

points that lie on the same line

Answer 7

Collinear -

Question 8

any two angles whose sum is 90°

Answer 8

Complementary Angles -

Question 9

interior angles that are on the same side of the transversal

Answer 9

Consecutive Interior Angles -

Question 10

exterior angles that are on the same side of the transversal

Answer 10

Consecutive Exterior Angles -

Question 11

points that lie on the same plane

Answer 11

Coplanar -

Question 12

angles on the same side of the transversal and in the same position

Answer 12

Corresponding Angles -

Question 13

triangle with 3 congruent angles

Answer 13

Equiangular Triangle -

Question 14

triangles with 3 congruent sides

Answer 14

Equilateral Triangle -

Question 15

an exterior angle is formed by extending any one side of the triangle

Answer 15

Exterior Angle Theorem -

Question 16

triangle with 2 congruent sides

Answer 16

Isosceles Triangle -

Question 17

made up of points with no thickness or width

Answer 17

Line -

Question 18

a measurable part of a line consisting of 2 endpoints

Answer 18

Line Segment -

Question 19

a point that divides the segment into two congruent segments

Answer 19

Midpoint -

Question 20

triangle with an angle greater than 90°

Answer 20

Obtuse Triangle -

Question 21

two coplanar lines that never intersect

Answer 21

Parallel Lines -

Question 22

planes that never intersect

Answer 22

Parallel Planes -

Question 23

a line, segment, or ray perpendicular to a segment at its midpoint

Answer 23

Perpendicular Bisector -

Question 24

a flat surface made up of points and extends indefinitely in all directions

Answer 24

Plane -

Question 25

a location with no size or shape

Answer 25

Point -

Question 26

line that extends indefinitely in one direction

Answer 26

Ray -

Question 27

triangle with one right angle (90°)

Answer 27

Right Triangle -

Question 28

triangle with no congruent sides

Answer 28

Scalene Triangle -

Question 29

if A, B, and C are collinear points and B is between A and C then AB + BC = AC

Answer 29

Segment Addition Postulate -

Question 30

non coplanar lines that never intersect

Answer 30

Skew Lines -

Question 31

any two angles whose sun is 180°

Answer 31

Supplementary Angles -

Question 32

a line that intersects two or more lines

Answer 32

Transversal -

Question 33

an exterior angle is formed by extending any one side of the triangle

Answer 33

Triangle Midsegment Theorem -

Question 34

the sum of the measures of the angles of a triangle is 180°

Answer 34

Triangle Angle Sum Theorem -

Question 35

two angles across from each other on intersecting lines; they’re always congruent

Answer 35

Vertical Angles -