The side lengths of a right triangle form a so-called Pythagorean triple. A triangle that is not a right triangle is sometimes called an oblique triangle. Special cases of the right triangle include the isosceles right triangle (middle figure) and 30-60-90 triangle (right figure).
The first pacemaker was implanted on 8th October 1958 in a 43 year old man called Arne Larsson with complete heart block and Stokes-Adams attacks. Technological innovations between 1973 and 1980 rendered obsolete the reliable pacemaker of 1970.
Avoid strenuous activities for around four to six weeks after having your pacemaker fitted. After this, you should be able to do most activities and sports. However, if you play contact sports, such as football or rugby, it is important to avoid collisions. You may want to wear a protective pad.