Extend EB, cross AG at N point, extend HA, cross GF at O point, take G as the vertical line of AO, take F as the vertical line of BN, and cross Q.

We can prove that △BQF is equal to △AGP is equal to △ABC.

∴HA=AP,BE=BQ

∴△HAG equals△△△ AGP, while△△ BEF equals△△△ BQF.

∴ Shadow area = double area △ ABC =0.84