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saltedpasta
The length is 25cm and the surface area is 1008 cm.

To calculate surface area of an object you must calculate the area of each shape land then add them all together.
zhiwenc12

Answer:

Total Surface Area = 1008 cm^2

Step-by-step explanation:

2 X 1/2 X (12 X 9) (Surface area of the two triangles) (Area of triangle = 1/2 Base X Height)

+ 25 X 15 (Slanted Surface)

+ 25 X 9 (Back Rectangle)

+ 25 X 12 (Bottom Rectangle)

= 1008