Triangles and Quadrilaterals? Yes, Ma’am!

Are these triangles? Yes, ma’am!

Are these triangles? Yes, ma’am!

How do you know? They have three sides.

How else do you know? They have three vertices.

Are these right triangles? Yes, ma’am!

Are these right triangles? Yes, ma’am!

How do you know? They have right angles.

How else do you know? Each angle is 90 degrees.

Are these quadrilaterals? Yes, ma’am!

Are these quadrilaterals? Yes, ma’am!

How do you know? They have four sides.

How else do you know? They have four vertices.

Can you give me an example? A square!

Can you give me

another example? A rectangle!

How do you know? They have four right angles.

How else do you know? Each angle is 90 degrees.