INVESTIGATION 1 I-CHECK ENERGY
1. A group of students in another class needs your help.
They want to design a switch to control a circuit that
runs a motor. The materials that were available were
a thin sheet of copper, brass fasteners, and a paper clip.
They used the materials as you see in the diagram.
When they put the switch into the circuit with the
D-cell and motor, the motor spun all the time. No
matter what position the switch was in, open or closed,
the motor kept spinning.
a.
What do you think the problem is with the switch?

The Given plane region is missing attached below is the plane region

answer : 24 π  or 75.40 sq. units

Step-by-step explanation:

Given data :

Height of plane region = 3

base of plane region  = 4

When we revolved the plane region completely we will we forming a cone hence we will calculate for the surface area of a cone

Radius of the new cone = 3

Height of the cone = 4

slant height of the cone ( l )  =  = 5

surface area of cone = πr^2 + πrl

                                   = π ( 3 )^2  + π (3 ) ( 5 )

                                   = 24 π  or 75.40 sq. units