2D shapes

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Across
  1. 4. the intersection point of all the altitudes from a triangle
  2. 5. a triangle with three equal sides
  3. 7. the intersection point of all the medians in a triangle
  4. 8. the angle in an isosceles triangle between the two equal legs
Down
  1. 1. a triangle with two equally long sides
  2. 2. the angle in an isosceles triangle between the base and one of the other legs
  3. 3. line segment connecting a vertex and the midpoint of the opposite side
  4. 6. line segment that starts at a vertex and is perpendicular to the opposite side