Define
define angle
the space between two intersecting lines or surfaces at or close to the point where they meet.
the highest point
vertex
number 1
acute
2
75
1
20
define complementary angles
two angles whose sum is 90°
two angles that have a common vertex and a common side
adjacent angles
number 2
right
3
37
2
140
define supplementary angle
two angles whose sum is 180°
number 6
right
6
60
6
79
define vertical angle
the pairs of opposite angles made by two intersecting lines
number 8
acute
4
Hint 2 angles
both 72
3
50
number 9
obtuse
5
105