Answer:
976 cm^2.
Explanation:
The surface area consists of 2 congruent triangles + 2 congruent sloping rectangles + a rectangular base.
Area of the 3 triangles 1/2*base*height * 2
= base * height
= 14*24 cm^2
Area of the 2 rectangles = 2*25 * 10
= 20*25 cm^2
Area of the base = 14 * 10 cm^2
So total surface area = 14*24 + 20*25 + 14*10
= 976 cm^2.