Heron's Formula

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Across
  1. 3. A triangle that has 2 equal sides is called ___________
  2. 5. area of ___________ triangle = (√3)/4 side X side
  3. 6. ______________ = (a+b+c) /2 , where a,b,c are the sides of a triangle
  4. 8. Area of a triangle = ½ X base X ______
  5. 9. A tool used to measure angles is called ___________
Down
  1. 1. _______________ = a+b+c , where a,b,c are the sides of a triangle
  2. 2. The magnitude of a plane region is called ________________
  3. 4. A triangle with unequal sides is called ___________
  4. 7. An angle that measures 90 degrees is called ________