# mathematics

##### Across
1. 2. a quantity obtained by multiplying quantities together, or from an analogous algebraic operation.
2. 4. a plane figure with four equal sides
3. 5. a plane figure with three straight sides and three angles
4. 7. linear distance around the outside of the closed curve or circular object
5. 11. to take a number or a amount from another to calculate the difference
6. 12. angle less than 90 degrees
7. 14. a number by which another number is to be divided.
8. 16. by adding the giving amount to another
##### Down
1. 1. a numerical quantity that is not a whole number
2. 3. ascertain the size ,amount or degree of something by using an instrument
3. 6. the measurement or extent of something from end to end;
4. 8. triangle with two equal sides
5. 9. round plane figure
6. 10. a number of quantity that when multiplied with another produces a given number
7. 13. the numerical value of the ratio of the circumference of a circle to its diameter
8. 15. measure of the amount od space inside a sold figure