##### Across

**2.**the longest chord of the circle;**3.**A set of argument values for which the function is defined;**5.**Any point at which the value of a function is largest or smallest;**6.**The point where the axes of the coordinate system intersect;**9.**A quadrilateral with two pairs of parallel sides;**10.**b2 − 4ac;**12.**Member x of the domain for which f(x)=0;**13.**A line segment joining a vertex to the midpoint of the opposing side;**15.**Two angles that sum to a straight angle are called ……… angles;**17.**The …. Is the angle subtended by an arc that has the same length as the circle’s radius (unit of angular measurement in the SI system);**18.**A function that repeats its values in regular intervals;**20.**The horizontal coordinate in a Cartesian coordinate system;

##### Down

**1.**……. angles – angles between 0-90 degrees;**2.**The expression written below the line in a common fraction that indicates the number of parts into which one whole is divided;**4.**A line is said to be …. To another line if the two lines intersect at a right angle;**7.**In geometry, the longest side of a right-angled triangle;**8.**Trigonometric ………. – equalities that involve trigonometric functions and are true for every single value of the occurring variables;**11.**A triangle with two sides of the same length;**14.**……… form of a function – a form from which we can tell the coordinates of the vertex of parabola;**16.**Other name for absolute value;**19.**A function that is symmetric with respect to the y-axis;