Question

How many diagonals in triangle and in quadrilateral?

Answer 1

Hint: Try to visualise the figure and use the information that a straight line joining two opposite corners of a is called diagonal.

Complete step-by-step answer:

Triangles don’t have any diagonal since each vertex is adjacent to the other two. And, it’s not the case with quadrilaterals because a quadrilateral will have two pairs of opposite vertices. So, quadrilaterals have 2 diagonals.

Note: For such kind of problems, knowledge of basic definition of diagonal is enough.