standard_description: Derive the formula A = 1/2 ab sin(C) for the area of a triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.
problem_activity: Task
A spider walks on the outside of a box from point A to B to C to D and finally to point E as shown in the picture below.
[IMG]
Draw a net of the box and map out the path of the spider on the net.
Compare your net with those of some other people.
Cut out the net and put the box together to see if you are right.
How long is the path of the spider?


aligns: no