Maths

3. Amount of surface enclosed by a plane figure
4. Additive identity for rational numbers
6. Data in original form
8. To take a term from one side of an equation to the other by changing its sign
10. A triangle with two sides equal
12. unit of length
13. A parallelogram with sides of equal length
15. The polygonal regions that make up solids

1. The sum of the areas of the faces of a solid
2. The base of a triangular pyramid
5. The other term to represent exponent or index
7. The number of times that a particular entry occurs
9. Product of number and its multiplicative inverse
11. A polyhedron with two parallel opposite faces called bases, that are congruent polygons and the lateral faces are parallelograms
14. The square of odd numbers