It's either 8 cm or 1 m....i personally think 8 cm is more accurate but, 1 m is still an acceptable answer
The height of the envelope is 10. This is because you divide the area by 3. So, the missing side is 10 inches.
A, C, and D are all correct answers, since you are taking away 4 in each of the answers. Hope this helped!
Plane, it contains tons of 2d points with no set beginning or end
