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CSI by the Numb3rs
MathScience Innovation Center
Finding the Center of Circle• Draw two chords on the circle• Find the perpendicular bisectors for each• Where the two perpendicular bisectors meet
is the center of the circle
chord
chord
center Perpendicularbisector
Perpendicularbisector
Follow Sketchpad directions to determine diameter of plate
500 feet
1425 feet
Finding the Angle of Elevation
500 feet
1425 feet
Tangent Ratio
TangentAdjacent
Opposite=
5001425(
(
tan-1
1425500
500 feet
1425 feet
Solving for X=
x
tan x
x =
5001425(
(
tan-1
1425500
500 feet
1425 feet
Solving for X=
x
tan x
x =
x ≈ 19.33⁰
Use trig, shadow, and website to help determine the time of day
Suspect Worksheets
Your job:• Sort through the evidence • Listen to ipod and/or read
interviews• Find the criminal
Debriefing:
Share your ideas with your supporting evidence.
Please put all papers and documents back in proper spot
Return ipods
Move chairs/desks back to original position
Time to clean up . . .
The End