Circles and triangle

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Across
  1. 4. two figures having the same shape but not necessary the same size are called
  2. 5. longest side of a right angled triangle
  3. 6. a triangle that have 2 sides of equal measure
Down
  1. 1. bottom of a triangle
  2. 2. perimeter of a circle
  3. 3. a state line that touches a curve or curved surface at a point
  4. 7. a portion between two radii and an Arc
  5. 8. a straight line that connects any two point located on the circumference