Maths crossword puzzle

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Across
  1. 2. the number of square units that covers a shape
  2. 3. an equation of fractions in the form : a/b = c/d
  3. 5. the side opposite to the right angle in a right triangle
  4. 6. the line joining two points on a circle and passing through the center of the circle.
  5. 7. a straight line that connects two vetex in a given figure
  6. 8. measurement of a space or capacity.
Down
  1. 1. a letter used to represent a number value in an expression or an equation
  2. 4. angles measuring more than 90