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Mathematics 5 Online
OpenStudy (anonymous):

Awarding medal. Find the area of the rhombus if AE = 20 m and DE = 32 m. A. 640 m^2 B. 1,280 m^2 C. 104 m^2 D. 2,560 m^2

OpenStudy (anonymous):

OpenStudy (jdoe0001):

|dw:1374529810950:dw|

OpenStudy (jdoe0001):

so if you notice those 2 triangles, and were to use 20 as the stand them up as |dw:1374530534402:dw|

OpenStudy (jdoe0001):

in a rhombus, the diagonals cross each other at 90 degrees, and it's sides are equal, thus you find the area for one triangle, add it up 4 times for each, and that's the area of the rhombus

OpenStudy (anonymous):

so the answer is B?

OpenStudy (jdoe0001):

yes

OpenStudy (anonymous):

thank you

OpenStudy (jdoe0001):

yw

OpenStudy (agent0smith):

In this case you probably can use the formula\[\Large A = 0.5 * d_1*d_2\] since you've likely used it in class. d1 and d2 are the lengths of the diagonals (note that they only gave half the length of the diagonals in the diagram)

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