Quiz 1 (Math 113)

Point

Names are uppercase letters

Line

made of many points. nickname is a lowercase letter. arrows on both sides

Ray

endpoint and ray. arrow on one side, dot on the other.

Plane

flat surface not thick (all points have names). name 3 letters non collinear. nickname lowercase letters on 4 corners

collinear

points on same line

vertex

where two lines meet, making an angle. when naming angel the letter always goes in the middle

angle types

acute, obtuse, right, straight. absolute value to make it positive when measuring with a protractor

classfying the angel

right - 90 degrees

acute - less than 90

straight - 180 degrees

obtuse - more than 90 less than 180

parallel line

never meet; both sides have an arrows

vertical angels

opposite angles forming the X

adjacent

next to each other

linear pair

adjacent angels that form a straight line (angels add to 180 degrees)

perpendicular

makes 90 degrees angle

complementary

two angles whose measure adds up to 90

supplementary

two angles whose values measure up to 180

angle of incidence

angle between an incoming wave or ray and the normal line (an imaginary line drawn at a 90-degree angle perpendicular to the surface

angle of reflection

the angle between the reflected wave or ray and the normal line (the 90-degree perpendicular line).