##### Across

**4.**when the sum of two angles is equal to 90 degree**10.**who's volume is l*b*h**13.**the opposite sides are parallel and equal to each other and all four angles are right angles**15.**a triangle in which all three sides have the same length

##### Down

**1.**a number that can be represented as the quotient p/q of two integers such that q ≠ 0**2.**the point of intersection of all the three medians of triangle**3.**a six-sided polygon**4.**perimeter of a circle is called**5.**the average of the given numbers**6.**part of a line with one end point**7.**When none of the sides of a triangle are equal**8.**angle that is less than 90⁰**9.**a line which intersects two or more lines at distinct points**11.**lines that never meet**12.**half of diameter**14.**number staring from 1 is called