# Geometry Postulates and Theorems 6-7

## 25 terms

### Parallel postulate

Through a point not on a line, there is exactly one line parallel to the given line

### Equal corresponding angles...

lines are parallel

### Equal alternate interior angles...

lines are parallel

### Supplementary interior angles...

lines are parallel

### Two lines perpendicular to a third line

lines are parallel

### Parallel lines form...

supplementary interior angles on the same side of the transversal

### Angle sum

Sum of the angles of a triangle is 180

### Acute angles of right triangle...

are complementary

### Exterior angle of triangle...

equal to sum or remote interior angles

### AAS

If two angles and side opposite are equal to another triangle, the triangles are congruent

### HL

If the hypotenuse and leg of a right triangle are equal to another right triangle, the triangles are congruent

360

are equal

### Diagonals of parallelogram

bisect each other

### (sides) A quad. is a parallelogram if

its opposite sides are equal

### (angles) A quad. is a parallelogram if

opposite angles are equal

### (both) A quad. is a parallelogram if

two opposite sides are parallel and equal

### (diagonal) A quad. is a parallelogram if

its diagonals bisect each other

### All rectangles

are parallelograms

### All rhombuses

are parallelograms

are equal

### Diagonals of a rhombus

are perpendicular

### Base angles of an isosceles

trapezoid are equal

### Diagonals of an isosceles

trapezoid are equal

### Midsegment theorem

A midsegment of a triangle is parallel to the third side and half as long