this is about: geometry and measurement unit test part 1

Question

9.find the area of the parallelogram with a base of 471.5 cm and height of 21.3
and the choose options are these:
~492.8 cm and exponent of 2
~10,04295 cm with a exponent of 2
~20,085,9 cm exponent of 2
~985,6 cm and exponent of 2.

492.8 cm exponent of 2 i got wrong and it says this on the test that 10,042,95 cm and exponent of 2 is Right. and i need to show how i got the answer step by step and please help me as soon as possible. please and thank you so much y'all.

Answer 1

sorry.

Answer 2

i don't need help anymore. with that question

Answer 3

The circumference of mars is about 10,664 km. find the diameter of mars to the nearest km.
the answer chose's are these:
17.256\3,396/333/259

17.256 i got wrong and
3,396 is right and i need step by step how to solve this. question.

Answer 4

Circumference = πd, where d is the diameter
10664 = πd
d = 10664/π = appr 33502 km

Answer 5

thanks so much.