The area of a regular pentagon looks about twice as a big as the pentangle star drawn within it. Is it?
Prove that the internal angle bisectors of a triangle will never be
perpendicular to each other.
Triangle ABC has a right angle at C. ACRS and CBPQ are squares. ST
and PU are perpendicular to AB produced. Show that ST + PU = AB
Can you work out the
perimeter of the flower's petals?
Now consider a flower made
by the triangle rotating about a square - what is the perimeter of
the petals now?
What is the perimeter when
the centre of the flower is a regular pentagon, hexagon,
What can you say about the increase in perimeter as the number of
sides of the centre shape increases?
Can you explain this increase?
What would be the perimeter of a flower whose centre is a regular
$100$-sided polygon with side length $r$?