Atriangular pyramid has a surface area of 336 square inches, it is made up of equilateral triangles with a side length of 12 inches, what is the slant height

Since the sides are equilateral triangles the slant height is the same as the normal height of an equilateral triangle with sides of 12 inches...

sin60=h/12

h=12sin60 in

h=10.4 in (to nearest tenth)

Yes you do, so £1973.09 - £1473.50 = £499.59 so tim overpaid £499.59 .hope this ; )