Question

I’m not going to beg like majority, but could somebody help me with these just to see if they form a right angle?

Answer 1

the third one

it’s has a straight horizontal line connected to a straight vertical line

Answer 2

Number 3 is a right triangle

Explanation:

I found out this by making a tiny square on one corner, and I tried on all of them.

I think that is the only one, so tell me if this is correct.