# Maths

##### Across
1. 5. invented zero
2. 7. those angles that sum up to 180 degrees
3. 11. father of mathematics
4. 12. longest side in a right-angled triangle
5. 15. When the sum of two angles is equal to 90 degrees
6. 16. a resultant number when one number is divided by the other number
7. 19. if the lines are parallel
8. 20. An angle which is measuring less than 90 degrees
##### Down
1. 1. A constant is a value or number that never changes in expression
2. 2. when 2 figures shape is same, but size is proportional
3. 3. U-shaped curve that is drawn for a quadratic function
4. 4. a line that passes through two lines in the same plane at two distinct points in the geometry
5. 6. a number or quantity placed with a variable
6. 8. A line that touches the circle at a single point
7. 9. if the lines intersect at a point
8. 10. an alphabet or term that represents an unknown number or unknown value or unknown quantity
9. 13. instrument used for meaning angles with a rotating telescope
10. 14. when 2 figures are in equal shape and size
11. 17. triangle that has at least two sides of equal length
12. 18. any angle greater than 90°