Area of a quadrilateral whose sides and one diagonal are given, can be calculated by dividing the quadrilateral into .............. triangles and using the ............... formula. 

(a) two, semi-area (b) three, Heron's (c) four, Heron's (d) two, Heron's

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(d) Area of the quadrilateral whose side and one diagonal are given can be calculated by dividing the quadrilateral into two triangles and using the Heron's formula.

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