Perímetro de um semicírculo?

#"the perimeter (P ) or circumference of a circle is"#

#color(red)(bar(ul(|color(white)(2/2)color(black)(P=2pir=pid)color(white)(2/2)|)))#

#"where r is the radius and d is the diameter"#

#"here it is a semicircle, that is half the circle"#

#rArr1/2xx2pir=pir" is the perimeter"#

#"here " d=10rArrr=10/2=5#

#"the perimeter of this semicircle includes the diameter"#

#rArrP=(pixx5)+10#

#color(white)(rArrP)=(3.142xx5)+10#

#color(white)(rArrP)=15.71+10=25.71" cm"#