##### Across

**2.**The side is other than the opposite side. (Trigo)**5.**An angle less than 90 degrees. (Trigo)**6.**A sequence where each term is a multiple of the previous term. (Math)**8.**Terms between two terms of a geometric sequence. (Math)**9.**A sequence of numbers such that the difference between two consecutive terms is a constant. (Math)**11.**Used to determine the values of the terms in the Fibonacci sequence. (Math)**14.**The sum of its first n terms. (Math)**15.**An angle of more than 90 degrees, but less than 180 degrees. (Trigo)**16.**A sequence whose first two terms are and the succeeding terms are formed by adding the preceding two terms.(Math)**17.**Translated the "Almagest". (Trigo)**18.**The side opposite of the given angle. (Trigo)**20.**The sum of the terms of a geometric sequence. (Math)

##### Down

**1.**The constant number for the difference between two consecutive terms. (Math)**3.**An angle of exactly 180 degrees. (Trigo)**4.**are obtained by finding the sum of the first n terms of an infinite series. (Math)**7.**An angle of exactly 90 degrees. (Trigo)**10.**A sequence of numbers whose terms are just the reciprocals of an arithmetic sequence. (Math)**12.**The side opposite of the right angle. (Trigo)**13.**Studies the properties of a triangle in a plane and its two-dimensional. (Trigo)**19.**An angle of more than 180 degrees, but less than 360 degrees (Trigo)