What is the length of s (the height of one of the triangular faces)?
Round your answer to the nearest tenth.

Answer:
s = 16.2 units
Step-by-step explanation:
s^2 = 15^2 + 6^2 (6 is 1/2 of 12)
s^2 = 225 + 36
s^2 = 261
s = 16.16