Answer
The central carbon has two pi bonds, one on each side. pi bonds are formed between aligned p-orbitals of the carbons.
Work Step by Step
The central carbon is sp hybridized and so has 2 p-orbitals. The two carbons on the sides are sp2 hybridized and so each has 1 p-orbital. For the central carbon to have pi bonds with both carbons, the p-orbitals of central carbon must be 90 degrees from one another (in 2 different planes). The p-orbitals of the side carbons must align with one of the p-orbitals of the central carbon (be in the same plane/ have the same angling). Therefore, the p-orbitals of the side carbons are 90 degrees to each other, which means the =CH2 groups are also 90 degrees to each other.
