It is obvious, that sport is very important in our life. There are many advantages. Sport helps people to keep fit and be healthy. Sport brings the self-confidence and self-esteem. Sport makes you stronger and slimmer. Sport improves your mood and attention concentration. When you are physically active, your mind is relaxed. Physical exercises reduce the stress. If you like a team sport, it is the best way to make new friends. Nevertheless, sport can be dangerous. It can be resulted in injuries if you do exercises incorrectly. Keep in mind the possibility of serious injuries during strenuous exercise. So you should carefully choose the sport activity that will suitable for your health.
Объяснение:
the side surface of this pyramid consists of 6 isosceles triangles with a base 16 and a side 17.
Find the area of one triangle.
S = 1/2bh, where b is the base and h is the height.
The height is found by the Pythagorean theorem.
The height is equal to the square root of the difference between the squares of the side of the triangle and the half of the base. Half of the base 16 / 2 = 8
17*17 - 8*8 = 225. The square root of 225 is 15. The height of the triangle is 15. Then the area of the triangle will be equal to S = 1/2*16*15 = 120 and the area of the side surface of this pyramid is equal to the area of one triangle multiplied by 6. S1 = 120 * 6 = 720
