Answer:
It is C. 3 cm, 3 cm, 9 cm.
Step-by-step explanation:
3x3=9, and then 9x9=81.
Answer is in the photo. I can only upload it to a file hosting service. link below!
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Answer:
i don't know sorry
Step-by-step explanation:
but i can try and work it out but it will take me a while
If you draw an octagon (eight-sided polygon), select one vertex and construct each diagonal from this vertex, you will see there are 5 such diagonals. Thus, for each of the 8 vertices you can draw 5 diagonals and hence there can be 5 × 8 = 40 diagonals.
You need to find the sum of the areas of the 6 sides.
That will be:
2*10*5+2*5*4+2*4*10=220