How many triangles and quadrilaterals?

Count how many triangles and quadrilaterals are there? Change the value of slider n. How many triangles are there when the slider value is n. How many quadrilaterals are there when the slider value is n. How many segments? How many intersection points? Read the story in Finnish at https://mikkorahikka.blog/2021/07/29/pari-pienta-kolmio-ja-neliopahkinaa/