First: the side length of square ABCD is 1, e and F are the midpoint of BC and CD respectively, and they are folded into a triangular pyramid along AE, EF and AF, so that the three points B, C and D coincide. Then the volume of this triangular pyramid is? Second: in the cube abcd-a1b1c1d1, e, F, G and H are the midpoint of BC, CD, CC1 and c1d1 1. Verification of a1g vertical plane efc1 2. Verification of BH parallel plane efc1 The picture should be drawn by oneself, ha ha

First: the side length of square ABCD is 1, e and F are the midpoint of BC and CD respectively, and they are folded into a triangular pyramid along AE, EF and AF, so that the three points B, C and D coincide. Then the volume of this triangular pyramid is? Second: in the cube abcd-a1b1c1d1, e, F, G and H are the midpoint of BC, CD, CC1 and c1d1 1. Verification of a1g vertical plane efc1 2. Verification of BH parallel plane efc1 The picture should be drawn by oneself, ha ha

The first course is 1 / 24 in volume