Question

two adjacent sides of a parallelogram are 3cm and 4cm and one diagonal is 5cm.find its area?? ​

Answer 1

answer

the area of the parallelogram is

$2 \times \sqrt{6(6 - 4)(6 - 5)(6 - 3)} cm {}^{2} \\ =2 \times \sqrt{6 \times 2 \times 1 \times 3} \\ =2 \times 2 \times 3 \\ = 12cm {}^{2}$