Someone help pleasee

I’m which figure is point g an orthocenter

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.