##### Across

**2.**A line segment between two vertices in a graph (graph theory) or geometric shape..**3.**The symbol representing an nth root,.**7.**A number that is added to another number**9.**1. A unit of angle, commonly representing one-ninetieth of a right angle.**10.**The deviation from being perfectly circular.**11.**The locus of a point on the circumference of a circle rolling inside of another circle.**13.**A method of inference which attempts to "justify" conclusions by applying rules of inference on the premises of the argument and other such conclusions.**15.**A type of discontinuity, where the hole is a point whose inclusion into the curve would make the curve continuous.**16.**Also known as extraction, the process of finding a root of a number. The opposite process is called involution.**17.**An equivalence relation indicating two mathematical sentences to be necessary and sufficient conditon of each other.**19.**The centre of a circle which goes through all vertices of a triangle.**21.**A controlled process for making observations and gathering data.**22.**A beam or such similar structures which is anchored at only one end such that it resists rotation under load.**24.**An unproven (but also not disproven) assertion considered/assumed/proposed to be true.**25.**Rewriting a mathematical expression in an equivalent form that is considered to be longer or more complicated**27.**A measure of angle which is the ratio of the arc length to the radius formed by a circular arc with the angle.**28.**The condition of an expression of 2 variables that is linear while considering individually each variable (while the other variable is fixed.)

##### Down

**1.**An SI derived unit of radioacitivity denoted by the symbol Bq.**4.**The segment of the perpendicular bisector of a side of a regular polygon that runs between the centre and the side.**5.**A surface formed by the rotation of a catenary.**6.**A particular unit within a set of units of the same type. (e.g. CMwithin the set of units for lengths.)**8.**The process of splitting a mathematical object into two or more objects of the same type, such as fractions, functions or matrices.**12.**A branch of mathematics, the study of (infinitely many) infinitesimalquantities (which may be changing).**13.**A value under which a whole number of tenths of data fall.**14.**Also known as indefinite integration**17.**A plane figure with 2 right angles.**18.**A measure of how little an approximation deviates from the true value**20.**An informal name for symbol ∩, used to denote intersection of sets that is easier to say than the polysyllabic "intersection".**23.**A polynomial with two terms.**26.**A six-sided polygon.