Answer:
Area? or.. perimeter?
Explanation:
Separate the funky shape into a rectangle with 2 triangles on each side. Total height of the shape is 18cm, so the height of the triangle is 12 cm (subtract the 6cm bit). Top length and bottom length has a difference of 10cm, so each triangle has a bottom of 5 cm. Using a2+b2=c2, 144+25= 169, or 13. So perimeter is 10+6+6+13+13+20=68cm
If area, then 10x18=180+ ?
(triangle=1/2 x base x height)
=1/2 x 12 x 5= 30
180+60=240