Question

What do a triangle and a quadrilateral have in common?

Answer 1

Nothing except angles and some lines.
Okay joking, sorry. :)

There could be many common things.
1. They both are polygons.
2. They both have a total angle sum which is a multiple of 180 degrees. ( 180 degrees for triangle and 360 degrees for a quadrilateral.
3. A quadrilateral is made of two triangles joined together ( try making the diagonal ) .

Answer 2

aakash don't give answers

Answer 3

Well, I'd say that was rude. But since you are requesting, I'll stop here. ^_^