A cone because it is a circle when cut in half or anyway you cut it
Answer:
-4x=4+4
x=8/-4
x= -2
not sure how I'm supposed to verify
Add all shapes area together to know the figures complete area
triangles area 1 & 2 : 6×8 /2 -> 48/2 = 24
rectangle 1 : 6×12 -> 72
rectangle 2 : 8×12 -> 96
rectangle 3 : 10×12 -> 120
24+72+96+120
96+96+120
192+120
312cm
So hmm notice the picture below
thus

so, is clearly not 0, so it has to be 1.74