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