The property of the sides of a triangle. Reflection.

Drawing the central perpendicular and the perpendicular line of a segment.

5. Draw a casual triangle ABC. Do the necessary measuring and find the perimeter of the triangle. By how many centimeters is the perimeter of your triangle bigger (smaller) than the perimeter of your deskmate’s triangle?

 

 

6. Draw symmetric triangles in relation to straight line s.

 

 

7. Draw ray AC and straight line t cutting it. Reflect the ray AC in relation to straight line t.

 

 

8. Draw triangle KLM. Cut that triangle with straight line u. Reflect the given triangle in relation to the straight line u. Find the perimeter of the given triangle and the reflected triangle. What can you conclude?

 

 

9. What is the reflection of a straight line if the straight line is on the reflection-axle? Do a drawing.

 

 

10. Draw a rectangle ABCD. Cut its sides CD and BC with straight line t. Reflect the triangle from the straight line t.