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

2 Answers
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"

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"