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In parallelogram ABCD, AB=125cm, AD=132cm, and the length of diagonal AC is 37cm. The area of the parallelogram, in cm2, is

 
 Oct 8, 2021
 #1
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[ABCD] = 4620 cm2

 
 Oct 9, 2021
 #2
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First draw a pic

2) find (theta)         Use cosine rule         

3) 2 times the area of the triangle.     

 

Bingo.

 

 
 Oct 9, 2021

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