The Solution.
Step 1:
We shall determine the radius (r) of the circular base of the cone by dividing its diameter by 2.
![\text{radius (r)= }(diameter)/(2)=(14)/(2)=7\operatorname{cm}]()
Step 2:
We shall find the vertical height of the cone by using the Pythagoras Theorem.
By Pythagoras Theorem. we have
![undefined]()
Step 3:
We shall state the formula for calculating the surface area of the cone.