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 square has four right angles. A straight angle measures exactly 180 degrees. How many sides does a triangle have? What type of angle measures exactly 180 degrees? A triangle has three sides. A triangle has three sides. What type of angle measures exactly 180 degrees? How many right angles are there in a square? How many right angles are there in a square? A straight angle measures exactly 180 degrees. A square has four right angles. How many sides does a triangle have?