Maths

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Across
  1. 3. - shapes
  2. 4. - synonym for heap
  3. 6. - resting _____
  4. 8. - sound
Down
  1. 1. - king of orders
  2. 2. - mother of addition and area's sibling
  3. 5. - slice of pie
  4. 6. - right, obtuse, straight
  5. 7. - something that makes sense