Math Mind Grid

123456
Across
  1. 1. seven piece puzzle
  2. 4. full form of BMI
  3. 5. shape of a pizza
  4. 6. where 2 lines meet and is equal in an equilateral triangle
Down
  1. 1. polygon with three sides
  2. 2. polygons with four sides
  3. 3. part of a whole which has numerator and denominator