Perimeter
Considering the perimeter of the semi circle
Circumference C =(1/2) πd
=(1/2) π x 8
= 12.57 mm
Considering the longest part of the triangle
the sides of the tri19-4) =15 , ?
Since it is a right angled triangle
The Longest side =√[(15^2)+(8^2)]
= √[225+64]
= √289
= 17 mmm
Perimeter of figure
= p(semi circle) + p(2 other lines left to close the figure)
= 12.57 + 17+ 15=44.57mm