Question

23 cm

Answer 1

Answer:

445.2 square cm

Step-by-step explanation:

The surface area consists of  area of two bases and area of three leteral faces. Each lateral face is a rectangle with length of 23 cm and width of 6 cm.

The area of rectangle is

$A_{rectangle}=\text{length}\times\text{width}$

So,

$A_{rectangle}=23\times 6=138\ cm^2$

The area of base is given as $15.6\ cm^2$

Thus, the surface area is

$SA=2A_{base}+3A_{lateral\ face}\\ \\SA=2\cdot 15.6+3\cdot 138=445.2\ cm^2$