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4. A pyramid has a square base of side 18 cm and the height of each
triangular face is 40 cm. Find the surface area of the pyramid.
A. 1 764 cm²
B. 1 674 cm²
C. 1 476 cm²
D. 1 746 cm²​

Sagot :

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A. 1764 cm²
Formula:

Triangle: 40 x 18= 720
720 x 1/2= 360
360 x 4= 1440

Square:
18 x 18= 324

Total: 1440+324=1764 cm²
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