Question

Two rectangular pyramids were joined at their bases to form the composite figure.

What is the surface area of the figure?
1,025 cm2
1,175 cm2
1,325 cm2
2,050 cm2

Answer 1

If your on Ed, it's 1020.

Explanation:

Answer 2

we know that

surface area of pyramid=area of the base+[area lateral triangle sides]

in this problem
the base area is not considered
so
surface area smaller pyramid=2*[15*16.4/2]+2*[10*17.3/2]
surface area smaller pyramid=246+173-----> 419 cm²

surface area larger pyramid=2*[15*23.8/2]+2*[10*24.9]

surface area larger pyramid=357+249-----> 606 cm²

surface area of the figure=419+606-----> 1025 cm²

the answer is
the surface area of the figure is 1025 cm²