##### Across

**4.**q ----- p**7.**rigid transformation**8.**a line that intersects two coplanar lines at distinct points, usually parallel**11.**a point where two rays begin or meet, where two line segments join or meet.**12.**nQ -------- nP**17.**altering a statement by writing the negative of the statement.**18.**a pair of adjacent angles (180) degrees whose non common side are opposite rays.**20.**2 + 5 = 7 7 = 2 + 5

##### Down

**1.**an unproven statement that is based on an observation.**2.**is a point that divides a segment into two congruent segments.**3.**a ray that divides an angle into two congruent coplanar angles.**4.**two angles whose sum is 90 degrees.**5.**are two non-adjacent angles formed by intersecting lines.**6.**If a = b and b = c, then a = c**9.**ab = ab**10.**Next to**12.**alternate interior/exterior angles, and corresponding angles are?**13.**when a line meets or crosses another line at 90 degrees.**14.**two angles whose measure has a sum of 180 degrees.**15.**educated guess**16.**an angle formed by the perpendicular intersection of two straight lines.**19.**corresponding parts of congruent triangles are congruent