Across
- 3. sum of all observation upon number of observation is equal to _________ ?
- 4. Friedrich _____________ is the prince of mathematics.
- 5. between any two rational numbers, there are _________ rational numbers.
- 6. all _________triangles are similar.
- 7. all the radii of the circles are _______ .
Down
- 1. product of a non-zero rational and an irrational number is always _________ .
- 2. what does the graph of a quadratic equation look like ?
- 6. the length of the tangents drawn from am external point to a circle are ________ .