It is a rhombus
It is so because all its sides are equalto 10cm.
opposite angles are equal. in a parallelogram opposite angles are equal but all sides aren't equal but in case of a rhombus it is so.
HOPE IT HELPS YOU '_'
Answer:
-720
Step-by-step explanation:
Answer:
Step-by-step explanation:Idon't say u must have ro mark my ans as brainliest but if u think it has really helped u plz don't forget to thank me....
I really hope this is right, i don’t quite remember how to do these but i think c
Answer:

Step-by-step explanation:
2/3 pi radians = 2/3 * 180 = 2 * 60 = 120 degrees
split triangle in half:
30, 60, 90 triangle
1/2 PR= 4 root 3