Answer:
there is a half circle with a diameter of 20cm
P = (2*pi*r)/2 =(2*pi*10)=62.8/2=31.4cm
the triangle is assumed to be right-angled
pythagoras' theorem
hypotenuse² = 30²+40²
hypotenuse = V2500=50cm
Perimeter figure :
30+50+40+30+31.4=181.4cm
Explanation: