How to combine two shapes in svg

Question

I want to make a figure by combining two svg shapes, but if I place one shape then the second shape is not visible.
For example --

<svg>

<polygon points = "70,20 240,20 210,120 40,120" style="fill:none;stroke:#000000;stroke-width:3;stroke-opacity:0.9"></polygon>

</svg>

Now in this code I have to insert a line
How can I do that.

Answer 1

Shudarshan Rai 👑
If I start with different points than also it is not visible.
I have to insert a line with
x1="70" y1="20" x2="70" y2="120"
How can I do that

Answer 2

//Because 1 overlys to another, you have to create both shapes in one svg it will fix problem with 2 different starting positions