Drag the YELLOW dots to adjust the angles of the bowtie.[br][br]Drag the BLUE dot to shift the bowtie up and down.[br][br]Drag the GREEN dot to shift the shape of the bowtie[br]from left to right.[br][br]The right hand panel shows the area of the bowtie.[br] [br]How does the area of the bowtie vary as you drag[br]the GREEN and BLUE dots?[br][br]How does the area of the bowtie vary with the angle(s)[br]of the YELLOW dots?