What goes the following red symbol mean in an polygon?
2 points
4 cm
A
8 cm
12
a
8
o
4
90 degrees
right angle ==> 90 degrees
![What goes the following red symbol mean in an polygon 2 points 4 cm A 8 cm 12 a 8 o 4 90 degrees right angle gt 90 degrees class=](https://us-static.z-dn.net/files/dfb/2a9f68c7c0225b75571c638c1319976d.png)