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# Calculating distance of line watch

1. I know how to calculate the distance but keep making some error I'm not seeing. The co-ordinates are B(2,4) and A(6,2), when I find the distance, I get the root of 20. This distance is the base of the parallelogram.

Now I'm finding the area of a parallelogram using that line distance and the height of parallelogram has distance 10 (textbook says), so why does it say the answer for the area is 40? I can't see how to get the area of 40 from root 20 and 10 multiplied together?

Thank you
2. (Original post by Magenta96)
I know how to calculate the distance but keep making some error I'm not seeing. The co-ordinates are B(2,4) and A(6,2), when I find the distance, I get the root of 20. This distance is the base of the parallelogram.

Now I'm finding the area of a parallelogram using that line distance and the height of parallelogram has distance 10 (textbook says), so why does it say the answer for the area is 40? I can't see how to get the area of 40 from root 20 and 10 multiplied together?

Thank you
If the height you've given is perpendicular and the base is also perpendicular, then I believe that you are correct and theat your book is wrong.
I make it 20sqrt(5)
3. (Original post by Magenta96)
I know how to calculate the distance but keep making some error I'm not seeing. The co-ordinates are B(2,4) and A(6,2), when I find the distance, I get the root of 20. This distance is the base of the parallelogram.

Now I'm finding the area of a parallelogram using that line distance and the height of parallelogram has distance 10 (textbook says), so why does it say the answer for the area is 40? I can't see how to get the area of 40 from root 20 and 10 multiplied together?

Thank you
root 20 is correct, maybe a sketch would help, or try posting the whole question, there must be something else
4. (Original post by joostan)
If the height you've given is perpendicular and the base is also perpendicular, then I believe that you are correct and theat your book is wrong.
I make it 20sqrt(5)

+MAybe 10 is not the height perpendicular to its base, but the length of other side(the slating one).

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