The approximate area of the decagon with a side of 8cm comes to be 492.40 cm².
The side of the regular decagon = 8cm
<h3>What is a regular decagon?</h3>
A regular decagon is a polygon with 10 sides that are equal to each other.
The area of a regular decagon with side a is:

So, the area A of the regular decagon with a side of 8cm:


A=492.40 cm²
Therefore, the approximate area of the decagon is 492.40 cm².
To get more about the decagon visit:
brainly.com/question/19899848
So, let's take a look! When doing volume, we always do (addition) and nothing else. The only time that we would have to multiply is if we would have to find the area, but in this case, we are (going to figure) out what would be the volume.
We would sum up the following:

.
I believe that we would multiply this by (2) because we would have to find the other side as well.
And this would give us . . . 64 as it's volume.
V= (64)
-12 and -12/0 u think it could be right but I tried
Answer:
I will demonstrate the first two for you. The answer is 6, <u>30</u>, <u>54</u>, <u>78</u>, 102.
The answer to the second question is -3,<u> 21,</u> <u>45</u>, <u>63,</u> 93.
Step-by-step explanation:
Pardon the messiness. I hope this clarifies how to do it from now on! If not, please let me know if you need more help! xoxo