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