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