Books about 2D and 3D figures with explanations and problems?

In summary, the conversation discusses the search for books that can provide explanations and answer questions about specific mathematical concepts, such as the Exterior Angle Bisector Theorem, distance calculations in a cube, and lengths in a regular tetrahedron. The books recommended for this purpose include those by Kiselev, the Art of Problem Solving Introduction to Geometry, and Euclidean Geometry in Mathematical Olympiads by Evan Chen. The preferred level for these books is high school.
  • #1
songoku
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I am looking for books that contain explanations (or to be able to answer) about something like this:

1) Exterior Angle Bisector Theorem
The external angle bisector of a triangle divides the opposite side externally in the ratio of the sides containing the angle. This condition occurs usually in non-equilateral triangles.

2) Given cube ABCDEFGH with side 2 units and line DF passes through plane ABGH at point T. Find distance ET

3) Given regular tetrahedron TABC with side 3 cm. M is mid point of AT and N is mid point of BC. Find length of MNAny books are ok but preferably high school level.

Thank you
 
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  • #2
Is a proof-heavy text okay?
 
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  • #3
Muu9 said:
Is a proof-heavy text okay?
no problem
 
  • #4
Try the two geometry books by Kiselev, or the Art of Problem Solving Introduction to Geometry or Euclidean Geometry in Mathematical Olympiads by Evan Chen
 
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  • #5
Thank you very much Muu9
 

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