1-5 Angle Relationships1-6 Polygons

Perpendicular: two lines that meet at a 90° angle.

Are these linesperpendicular?

A

B

C

D

AD CB

Complementary: two angles that add up to 90°. (They do not have to be adjacent)

40°

50°

Supplementary: two angles that add up to 180°

150°

30°

Lil’ Wayne Says:Don’t ever assume

thangs from a drawing!

Wait until you know fo’ sho’!

Sort of…some things you can assume:

1. If you see a straight line, you can assume it is straight.

2. If you see angles next to each other, then they are really next to each other.

But, never, ever assume any type of measurementuntil it is told, or you can prove it!

• These two lines are perpendicular.

What do we know about all of the angles?

Polygons

Polygon: a closed figure with straight segments as sides.

No

Convex Polygons:

Concave Polygons:

• Perimeter: distance around.

Regular Polygon: A polygon that has all equal sides, and equal angles on the inside.

(Regular Polygons CANNOT be concave)