What is the name of the shape graphed by the function #r =1+3 sin theta#?

2 Answers
May 13, 2017

It is called a Limacon, French for snail.

Explanation:

Limacons were studied by Pascal.

May 13, 2017

Limaçon

Explanation:

Consider the following shapes for polar graphs:

Cardiod:
#r=a+-bcostheta# and #r=a+-bsintheta#
where #a=b#

Limaçon:
#r=a+-bcostheta# and #r=a+-bsintheta#
where #a!=b#

Rose Curve:
#r=acos(ntheta)# and #r=asin(ntheta)#
if #n# is odd, then #n# petals
if #n# is event, then #2n# petals

Lemniscate
#r^2=a^2cos(2theta)# and #r^2=a^2sin(2theta)#

Based on this list, we can determine that the given polar equation is a Limaçon