finding the center of circle draw two chords on the circle find the perpendicular bisectors for each...

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