MathDB

4

Part of 2018 Adygea Teachers' Geometry Olympiad

Problems(1)

angle between 2 planes, cube (2018 Adygea Teachers' Geometry Olympiad p4)

Source:

6/22/2020
Given a cube ABCDA1B1C1D1ABCDA_1B_1C_1D_1 with edge 55. On the edge BB1BB_1 of the cube , point KK such thath BK=4BK=4. a) Construct a cube section with the plane aa passing through the points KK and C1C_1 parallel to the diagonal BD1BD_1. b) Find the angle between the plane aa and the plane BB1C1BB_1C_1.
geometry3D geometrycubeangleplanes