Memory Plane geometry (D)Versión en línea Basic Questions about Geometry por Tatiana Cruz How many diagonals does a pentagon have? How many diagonals does a pentagon have? A triangle has three sides. How many sides does a triangle have? A square has four right angles. How many right angles are there in a square? A triangle has three sides. A straight angle measures exactly 180 degrees. How many right angles are there in a square? What type of angle measures exactly 180 degrees? A square has four right angles. What type of angle measures exactly 180 degrees? A straight angle measures exactly 180 degrees. How many sides does a triangle have?