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Hi, I don't know how to solve it, what formula I should use

Parallelogram diagonals 20cm and 30cm length, and it's longer side 23 cm. I need to find the area.

Hi Victoria,

The diagonals of a parallelogram bisect each other. Draw the diagonals so as to subdivide the parallelogram into four triangles. Applying the laws of cosines and sines within these triangles, you can determine all the side measures. Finally, you can use Hero's formula to get the areas of the triangle, and add them.

Thanks for asking,

Azeem

I welcome your questions on algebra, 2D and 3D geometry, parabolic functions and conic sections, and any other mathematical queries you may have.

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