Question 550018
Since the area of the base is 100 sq in. this means that the side length of the base is {{{s=sqrt(100)=10}}} inches. So the area of each triangular face is {{{A=(10*10)/2 = 100/2 = 50}}} square inches.



So 



Surface Area of Pyramid = Area of base + 4*Area of Triangular Face



Surface Area of Pyramid = 100 + 4*50 



Surface Area of Pyramid = 100 + 200



Surface Area of Pyramid = 300 square inches