# Vocabulary Quiz Unit 1

### 44 terms by vanloonmath

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### point

a location in space that has no size

### line

a straight path that extends forever in both directions

### plane

a flat surface that has no thickness and extends forever

### collinear

points that lie on the same straight line

### coplanar

points and lines that lie in the same plane

### line segment

part of a line with two endpoints

### ray

a part of a line that starts at one endpoint and extends forever in one direction

### intersection

the place or point where two lines or planes cross each other

### parallel lines

coplanar lines that never intersect

### distance

length of a path between two points

never ending

### congruent

figures having the same size and the same shape; equal

### midpoint

the point at which a line segment is divided into two equal segments

### bisect

to divide into two equal parts

### converse

a statement that switches the order of the hypothesis and the conclusion

### conditional statement

an "if-then" statement

### counterexample

an example that proves a statement false

### hypothesis

the "if" part of a conditional statement

### conclusion

the "then" part of a conditional statement

### perpendicular lines

lines that intersect at 90 degree angles

### transitive property

if a=b and b=c, then a=c

### acute triangle

a triangle with all three angles less than 90 degrees

### obtuse triangle

a triangle with one angle greater than 90 degrees

### right triangle

a triangle with one 90 degree angle

### Triangle Sum Theorem

the sum of all three angles in a triangle is 180 degrees

### Exterior Angle Theorem

the measure of an exterior angle of a triangle is equal to the sum of the two remote interior angles of the triangle

### Angle-Side-Angle Congruence

If two angles and the included side of one triangle are congruent to the corresponding two angles and included side of another triangle, then the triangles are congruent.

### Side-Angle-Side Congruence

If two sides and the included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle, then the triangles are congruent.

### Angle-Angle-Side Congruence

If two angles and the non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, then the triangles are congruent.

### Side-Side-Side Congruence

If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.

### Octagon

An eight-sided polygon

### Pentagon

A five-sided polygon

### Triangle

A three-sided polygon

### Hexagon

A six-sided polygon

### Concave

A polygon in which at least one angle curves or dents inward

### Convex

A polygon in which all of the angles curve or bulge outward

### Regular

A polygon with all congruent sides and all congruent angles

### Parallelogram

A quadrilateral with two pairs of parallel sides

### Rhombus

A quadrilateral with four congruent sides

### Square

A quadrilateral with four congruent sides and four right angles

### Trapezoid

A quadrilateral with only one pair of parallel sides

### Translation

A transformation where the pre-image "slides"

### Rotation

A transformation where the pre-image "turns"

### Reflection

A transformation where the pre-image "flips", creating a mirror image

Example: