9. The figure shows the a regular hexagonal nut of side 1 cm and length 3cm with a central hole of diameter 1 cm.
1cm
1cm
1cm
Calculate the volume of metal in the nut. (ignore the thread and give your answer correct to 3 s. f.​

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.