Properties of triangles

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Across
  1. 3. The ________ of a triangle means all the points lying on the sides of the triangle
  2. 4. What is the straight line that joins a vertex of a triangle with a point on the side opposite to it and is perpendicular to that side called?
  3. 6. One of the sides that contain a 90 degree angle in a right angled triangle
  4. 10. When 3 numbers are such that the square of the largest number is equal to the sum of the square of the other 2 numbers all 3 numbers are known as pythagorean _______
Down
  1. 1. What is the straight line that joins a vertex of a triangle with the mid point of the side opposite to it called?
  2. 2. The side opposite the 90 degree angle of a right angled triangle is called ________
  3. 3. A side of a triangle that is usually at the bottom
  4. 5. A ________ is a closed figure made of three line segments
  5. 7. Points that lie outside the triangle are called the ________ of a triangle
  6. 8. _________ theorem states the square of the length of a hypotenuse is equal to the sum of the lengths of the other 2 sides in a right angled triangle
  7. 9. The ________ of a triangle means all the points that lie inside the triangle