##### What do we know?
• We know how to get a diameter, drawing a chord.
• We know some properties of the similar rectangle triangles.
• We can use the programm SALSAJ in order to take measurements on a picture given ¡

##### What do we have to find out?
• We are asked to measure the Moon's diameter.

##### Work out
• Open SalsaJ and then open the picture below:
• Draw any line (a chord of the circumference) on the picture.
• This line intersects the edge of the circumference on two points.
• Measure (pixels units) the length of this line between these endpoints.
• Divide it up into equal parts.
• Now you can have the midpoint, M, find it helped by the programm SalsaJ.
• Draw a perpendicular to the line through the midpoint.
• Measure (on that line) the distance from M to the edge of the circunference of the Moon.
• Using your knoledges related with circumference's properties, find out the Moon's diameter.

solucion_tratamiento_imagenes_ingles.txt · Última modificación: 24/04/2017 13:13 (editor externo)      