Answer:
The center is the point 
Step-by-step explanation:
we know that
The center of the circle is equal to the midpoint of the endpoints of the diameter
so
The formula to calculate the midpoint between two points is equal to

substitute the values



therefore
The center is the point 
4/7,8/14,12/21,16/28,20/35,24/42,28/49,32/56,36/63,40/70 and so on are equivalent fractions to 4/7
Answer:
Selecciona la alternativa donde NO se ocupan números enteros
a) Recorrido de un ascensor.
b) La temperatura ambiental.
c) La talla de zapatos