There is a formula for the area of a parallelogram which is bxh
(base x height)
Remember the height is always straight so do not use the 12 value.
21x9=189
Hope this helped!
For first is B For second is C::::)
To solve this we need to use Pythagorean theorem

Answer: x≈6.4
R≈0.72m
<span>Rounded Number:
</span> 0.7