Can you find a focal point of trapezium?? if so how?

Question

I mean the shape

Answer 1

What use of the word trapezium are you referring? Neither of the two uses (see below) have any focal point.

Wikipedia:

A trapezoid (in North America) or a trapezium (in Britain and elsewhere) is a quadrilateral (a closed plane shape with four linear sides) that has at least one pair of parallel lines for sides. Some authors define it as a quadrilateral having exactly one pair of parallel sides, so as to exclude parallelograms, which otherwise would be regarded as a special type of trapezoid, but most mathematicians use the inclusive definition.

In North America, the term trapezium is used to refer to a quadrilateral with no parallel sides. The term trapezoid was once defined as a quadrilateral without any parallel sides in Britain and elsewhere, but this usage is now obsolete.

Wikipedia

The trapezium bone (greater multangular bone) is a carpal bone, in what is commonly referred to as the wrist.

The trapezium is distinguished by a deep groove on its palmar surface. It is situated at the radial side of the carpus, between the scaphoid and the first metacarpal bone.