# Math test Angles, lines, similar, congruent

### 13 terms by tgulch

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### acute angle

angles that measures less than 90 degrees

### right angle

angle that measures exactly 90 degrees

### obtuse angle

angle that measures more than 90 degrees, but less than 180 degrees

### straight angle

angle that measures exactly 180 degrees

### complementary angles

sum of the measure of two angles is 90 degrees

### supplementary angles

sum of the measure of two angles is 180 degrees

### vertical angles

opposite angles formed by two intersecting lines

### perpendicular lines

two intersecting lines that form 90 degree angles

### parallel lines

lines that never intersect

### skew lines

do not intersect and not parallel - they are in different planes

formed by two intersecting lines, angles that are next to each other

### transversal

line that intersects two or more lines

### corresponding angles

on the same side of the transversal and are both above (or both below) the parallel lines

Example: