Difference between revisions of "1964 IMO Problems/Problem 6"

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== Solution ==
 
== Solution ==
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Let <math>A_{2}</math> be the point where line <math>AD_{0}</math> intersects line <math>BC</math>
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Let <math>B_{2}</math> be the point where line <math>BD_{0}</math> intersects line <math>AC</math>
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Let <math>C_{2}</math> be the point where line <math>CD_{0}</math> intersects line <math>AB</math>
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Revision as of 22:40, 16 November 2023

Problem

In tetrahedron $ABCD$, vertex $D$ is connected with $D_0$, the centroid of $\triangle ABC$. Lines parallel to $DD_0$ are drawn through $A,B$ and $C$. These lines intersect the planes $BCD, CAD$ and $ABD$ in points $A_1, B_1,$ and $C_1$, respectively. Prove that the volume of $ABCD$ is one third the volume of $A_1B_1C_1D_0$. Is the result true if point $D_o$ is selected anywhere within $\triangle ABC$?

Solution

Let $A_{2}$ be the point where line $AD_{0}$ intersects line $BC$

Let $B_{2}$ be the point where line $BD_{0}$ intersects line $AC$

Let $C_{2}$ be the point where line $CD_{0}$ intersects line $AB$


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See Also

1964 IMO (Problems) • Resources
Preceded by
Problem 5
1 2 3 4 5 6 Followed by
Last Question
All IMO Problems and Solutions