Question

A parallelogram has sides 30 m and 14 m and one of its diagonals is 40 m long. Then, its area is : D C С 40 m 14 m 30 m​

Answer 1

Answer:

Area of parallalogram = 2×areaoftriangle

Area of triangle where three sides a,b,c are given is  

s(s−a)(s−b)(s−c)

​

, where s=  

2

a+b+c

​

 

Here s=  

2

30+14+40

​

=42

Area of△=  

(42)(12)(28)(2)

​

=  

28224

​

=168m  

2

 

Therefore area of parallalogram = 336m  

2

Step-by-step explanation:

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