His collection?
160
are
baseball
cards
gizmo warm-up
in the investigating angle theorems gizmo, you can manipulate a
dynamic figure to explore the properties of different angles.
1. in the gizmo, select vertical angles from the conditions menu. you
should see two intersecting lines like the ones shown to the right.
a
name the two pairs of angles that do not share a side. (they are nonadjacent.)
and
and
both pairs are vertical angles
b. drag the points to resize the angles. what appears to always be true about the
measures of the vertical angles?
turn on show angle measures and continue to resize to check if this is always true.
2. select form a linear pair to view a linear pair of angles (adjacent angles whose non-
de forma troiabt line