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HOW TO NAME AN ANGLE Geometry is an important topic in maths. Every major exam through to year 12 will contain questions relating to geometry. An angle is made up of two rays which meet at a common point called a VERTEX. For example, BA and BC are the arms of the angle Which meet at the VERTEX B. A x B There are four main ways of naming the above angle i) ABC or CBA ii) ABˆ C CBˆ A iii) B iv) x̂ or C NOTE: i) ii) iii) The vertex must always be the middle letter when using methods (i) and (ii) B can only be used if there is no possibility of confusion. Often the angle is actually marked with a small letter as shown in the example above as x̂ Example: Name the 2 angles shown in the diagram. P Q Solution: S R Any of the following answers would all be correct for the unshaded angle: PSR or RSP or PSˆR or RSˆP or S Any of the following answers would be correct for the shaded angle: PRQ NOTE: or QRP or PRˆ Q or QRˆ P R by itself could not be used to describe the shaded angle because of possible confusion with the angle right next to it.