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Grade: 10

                        

ABCD is a trapezium in which AB and CD are the parallel sides. The diagonals meet at point 0. If area of triangle ABO is p and area of triangle COD is q, prove that area of the trapezium is (√p+√q)²

3 years ago

Answers : (1)

Arun
24738 Points
							
 

Let h and g are the heights of the triangles AOB and COD respectively.Then, 1/2 x AB x h = p and 1/2 x CD x g = q so, AB = 2p/h and 2q/g also, p/q = AB2/CD2 so, AB/CD = vp/vq

 

Area of trapezium = 1/2(sum of parallel sides) x distance between them

 

                        =1/2 (AB + CD) x (h + g)

 

                        = 1/2 (vp/vqCD + CD) x (2p/AB +2q/CD)

 

Now replacing AB by 2p x vq/vp x CD and then solving the equation we get the area as (vp +vq)2 .    

where v stands for squareroot            

 
3 years ago
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