Question

lines and angles
across

1. never ending
2. an angle that measures more than 90 degrees but less than 180
3. a straight path that has a beginning but not ending
4. an angle that is 1/4 of a circle.
5. two angles whose sum is 90 degrees
6. a point where two angles begin or meet.
7. two rays that have a common end point

down

1. where lines cross over at a common point.
2. two angles that are next to each other
3. 3 or more points lying on the same line

Explanation:

• Across 2: A line that is never - ending is a ray (if it has a starting point) or a line (if it has no starting or ending point). Since the clue doesn't mention a starting point, the answer is "line".
• Across 4: An angle that measures more than 90 degrees but less than 180 degrees is an "obtuse" angle.
• Across 6: A straight path that has a beginning but not ending is a "ray".
• Across 7: An angle that is 1/4 of a circle (a circle has 360 degrees, so 1/4 of 360 is 90 degrees) is a "right" angle.
• Across 8: Two angles whose sum is 90 degrees are "complementary" angles.
• Across 9: A point where two angles begin or meet is a "vertex".
• Across 10: Two rays that have a common end - point form an "angle".
• Down 1: Where lines cross over at a common point is an "intersection".
• Down 3: Two angles that are next to each other are "adjacent" angles.
• Down 5: 3 or more points lying on the same line are "collinear" points.

Answer:

Across 2: line
Across 4: obtuse
Across 6: ray
Across 7: right
Across 8: complementary
Across 9: vertex
Across 10: angle
Down 1: intersection
Down 3: adjacent
Down 5: collinear