A community for students.
Here's the question you clicked on:
 0 viewing
mayankdevnani
 4 years ago
Two adjacent sides of a parallelogram are 51 cm and 37 cm. One of its diagonals is 20 cm, then its area is.....
a) \[412 cm^2\]
b) \[512 cm^2\]
c) \[612 cm^2\]
d) \[712 cm^2\]
mayankdevnani
 4 years ago
Two adjacent sides of a parallelogram are 51 cm and 37 cm. One of its diagonals is 20 cm, then its area is..... a) \[412 cm^2\] b) \[512 cm^2\] c) \[612 cm^2\] d) \[712 cm^2\]

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Use herons formula to calculate the area of one half of the parallelogram.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1354886905111:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1354886978203:dw

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1354887034102:dw

chihiroasleaf
 4 years ago
Best ResponseYou've already chosen the best response.0yes.., s = 54, then what is the area of the triangle?

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1354887176565:dw

chihiroasleaf
 4 years ago
Best ResponseYou've already chosen the best response.0yup..., now simplify ...

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1354887394948:dw

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0now, then multiply it by 2 to get 612 cm^2. so option c is right answer.....right???

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0right? @chihiroasleaf and @sauravshakya

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0any short method!!!!

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0@hartnn @sirm3d @amistre64 @AravindG @AccessDenied any short method!!!to solve this question!!!

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0@DLS @satellite73 @nubeer plz help me!!!

DLS
 4 years ago
Best ResponseYou've already chosen the best response.0if u were given the coordinates then I would've given u a shorter method

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0no, i am in 9 class its very long method

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0anyways!!! thnx...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I may have a way of calculating those coordinates quickly: dw:1354889186448:dw \[x^2+y^2=c^2\\x^2+(ya)^2=b^2\\x^2+y^2+a^22ay=b^2\\c^2+a^22ay=b^2\\y=\frac{b^2c^2a^2}{2a}\\x=\sqrt{\frac{b^2a^2}{2a}}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So now you know the coordinates of the parallelogram. There is a formula from algebra about how to calculate the area. It involves cross products or inner products or something?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0http://en.wikipedia.org/wiki/Parallelogram#The_area_on_coordinate_system

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0If you had good memory, you could just memorise the formula for x and y that I derived above. (I think it's right...) Then calculating the area would take about three lines.

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.0thnx... @scarydoor

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0actually the formula for x might be slightly off.... but it can be fixed I think.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.