<basic-shape> - CSS: Cascading Style Sheets
circle() circle( [<shape-radius>]?
...) the <shape-radius> argument represents r, the radius of the circle.
... ellipse() ellipse( [<shape-radius>{2}]?
...And 2 more matches

Basic Shapes - CSS: Cascading Style Sheets
the first is the shape-radius.
... both circle() and ellipse() values for shape-outside are specified as accepting this argument of <shape-radius>.
...i have given a value of 50% for the shape-radius value which means that our radius is 70px.

clip-path - CSS: Cascading Style Sheets
)<circle()> = circle( [ <shape-radius> ]?
...)<ellipse()> = ellipse( [ <shape-radius>{2} ]?
...<string> )<shape-box> = <box> | margin-boxwhere <length-percentage> = <length> | <percentage><shape-radius> = <length-percentage> | closest-side | farthest-side<position> = [ [ left | center | right ] | [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]?

offset-path - CSS: Cascading Style Sheets
)<circle()> = circle( [ <shape-radius> ]?
...)<ellipse()> = ellipse( [ <shape-radius>{2} ]?
..., [ <length-percentage> <length-percentage> ]# )<shape-box> = <box> | margin-boxwhere <shape-radius> = <length-percentage> | closest-side | farthest-side<position> = [ [ left | center | right ] | [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]?

shape-outside - CSS: Cascading Style Sheets
)<circle()> = circle( [ <shape-radius> ]?
...)<ellipse()> = ellipse( [ <shape-radius>{2} ]?
...)<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()> | <conic-gradient()>where <length-percentage> = <length> | <percentage><shape-radius> = <length-percentage> | closest-side | farthest-side<position> = [ [ left | center | right ] | [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]?

CSS data types - CSS: Cascading Style Sheets
<basic-shape> <blend-mode> <calc-product> <calc-sum> <calc-value> <color> <color-stop> <color-stop-angle> <counter-style> <custom-ident> <dimension> <filter-function> <flex> <frequency> <frequency-percentage> <gradient> <ident> <image> <integer> <length> <length-percentage> <number> <number-percentage> <percentage> <position> <quote> <ratio> <resolution> <shape-box> <shape-radius> <string> <time> <time-percentage> <timing-function> <toggle-value> <transform-function> <type-or-unit> <url> <url-modifier> <zero> specifications specification status comment css values and units module level 4 editor's draft css values and units module level 3 candidate recommendation initial definition.