Chapter C2- gr8 revision

Question 1

What are concentric circles?

Answer 1

Circles that have the same midpoint

Different radii

Question 2

What is a sectant?

Answer 2

Two lines intersecting

Question 3

What is a bisector?

Answer 3

One line intersects another exactly in the middel

Question 4

What are Parallel lines?

Answer 4

two or more lines that are always the same distance apart and will never cross each other

Question 5

What are Perpendicular lines?

Answer 5

A line is perpendicular to another line if it forms a 90 degree angle with the other line

Question 6

What is an acute angle?

Answer 6

an angle greater that 0 degrees but smaller than 90 degrees.

Question 7

What is a right angle?

Answer 7

an angle equal to 90 degrees

Question 8

What is an obtuse angle?

Answer 8

an angle greater than 90 degrees but smaller than 180 degrees

Question 9

What is a straight angle?

Answer 9

an angle equal to 180 degrees

Question 10

What is a reflex?

Answer 10

an angle greater than 180 degrees but smaller than 360 degrees.

Question 11

What is a revolution?

Answer 11

an angle equal to 360 degrees

Question 12

What are the conditions for two angles to be adjacent

Answer 12

• must have a common vertex
• must have a common arm
• the two angles must lie on either side of the common arm

Question 13

What are complementary angles

Answer 13

angles with a sum of 90 degrees

Question 14

What are supplementary angles

Answer 14

angles with a sum of 180 degrees

Question 15

Angles on a straight line

Answer 15

the sum of adjacent angles on a straight line is 180 degrees

Question 16

Vertically opposite angles

Answer 16

If two lines intersect each other, the vertically opposite angles are equal in size

Question 17

If two lines are parallel

Answer 17

• Corresponding angles are equal (F)
  - Alternate angles are equal (Z)
  - Co-interior angles add up to 180 degrees (U)