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Use herons formula to calculate the area of one half of the parallelogram.

|dw:1354886905111:dw|

|dw:1354886978203:dw|

|dw:1354887034102:dw|

yes.., s = 54,
then what is the area of the triangle?

Good going

|dw:1354887176565:dw|

yup..., now simplify ...

|dw:1354887394948:dw|

now, then multiply it by 2 to get 612 cm^2. so option c is right answer.....right???

right... :)

right? @chihiroasleaf and @sauravshakya

any short method!!!!

if u were given the co-ordinates then I would've given u a shorter method

no, i am in 9 class its very long method

-_-

anyways!!! thnx...

http://en.wikipedia.org/wiki/Parallelogram#The_area_on_coordinate_system

thnx... @scarydoor

actually the formula for x might be slightly off.... but it can be fixed I think.