If a semi circle has a diameter of 4cm then what is the perimeter?

2 Answers
Jim G.
Jul 1, 2018

#~~10.283" cm"#

Explanation:

#"perimeter "=1/2pid+4#

#"that is the semi circle plus diameter"#

#"color(white)(xxxxxx)=(1/2xxpixx4)+4#

#color(white)(xxxxxx)=2pi+4~~10.283" cm to 3 dec. places"#

Typo
Jul 1, 2018

#(4+2pi)"cm"#

Explanation:

#d=4 "cm"# - - - i
#2r=d# - - - ii
#"Perimeter"_"semicircle"= 2r+(2pir)/2#
Substitute in ii,
#rArrd+(dpi)/2#
Substitute in i,
#rArr(4+(4pi)/2)"cm"#
#rArr(4+2pi)"cm"#

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