Activity 1
Right-angled triangle and angles.
1) Place two points A and B. Draw the line segment AB.
2) Draw a line d perpendicular to AB going through A.
3) Place a point C on d.
4) Create triangle ABC.
5) Display the measures of the three angles of the triangle.
Question 1
What can you say about the sum of the three angles of the triangle?
Question 2
What can you say about the sum of the two acute angles of the right-angled triangle?