Example: Find the mean of the following: 1, 2, 3, 4, 5 Step 1: Find the sum of all numbers → 1+2+3+4+5 = 15 Step 2: Divide total by the number of numbers → 15 ÷ 5 = 3
Example: Are ∠AEC and ∠DEA adjacent angles?
E
C
A
B
D
False
True
Example: Line AB and Line CD are intersecting lines. If angle AEC is 40°, what is angle AED?
E
C
A
B
D
150°
140°
130°
Example: Angle DBA and angle ABC are supplementary angles. If angle ABC is 40°, what is angle DBA?
B
C
A
D
150°
140°
130°
Example: If angle AEC is 40° and angle DEC is 180° then what is angle DEA?