Mathematics triangles

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Across
  1. 3. to correspond to; match
  2. 4. the linear extent or measurement of something from end to end
  3. 7. to raise (a number or quantity) to the second power
  4. 9. , any line segment forming part of the perimeter of a plane geometric figure
Down
  1. 1. the side in a right-angled triangle that is opposite the right angle
  2. 2. a measure of angle
  3. 5. multiplied by
  4. 6. to combine (two or more numbers or quantities) by addition
  5. 8. the space between two straight lines that diverge from a common point or between two planes that extend from a common line