List questions from geometric-transformation

Published on 23 Mar 2026 - 8:35

312

Views

Let E, F be points on the side AB of a triangle ABC. Prove that if ∠ECA = ∠BCF, then |AE||AF| / |BE||BF| = |AC|^2/|BC|^2

Published on 23 Mar 2026 - 10:19

53

Views

Apollonius special case.

Published on 23 Mar 2026 - 14:27

120

Views

Middle lines in octagon are congruent

Published on 23 Mar 2026 - 13:12

219

Views

Prove if $ABCD$ is a parallelogram, $\angle OBA = \angle ADO \iff \angle BOC = \angle AOD$

Published on 23 Mar 2026 - 5:45

125

Views

High school geometry problem: Reflect a vertex about opposite side.

Published on 25 Mar 2026 - 1:25

140

Views

Can't figure out this triangle geometry problem

Published on 23 Mar 2026 - 7:44

389

Views

Napoleon-like theorem concerning squares erected on sides of midpoint polygon of octagon

Published on 23 Mar 2026 - 5:40

1k

Views

What is the radius and center of the image of $|z|=1$ under $ f(z) = \frac{3z+2}{4z+3}$?

Published on 23 Mar 2026 - 4:52

197

Views

Show that $MNPQ$ is a square

Published on 23 Mar 2026 - 0:23

256

Views

In acute $\triangle ABC$, show $DE+DF \leq BC$, where $D$, $E$, $F$ are the feet of the altitudes from $A$, $B$, $C$, respectively.

Published on 22 Mar 2026 - 19:17

101

Views

Intriguing geometry problem regarding isogonal lines

Published on 23 Mar 2026 - 8:58

1.2k

Views

Nine-point circle - proof using plane geometry

Published on 23 Mar 2026 - 14:05

298

Views

Visualization of 2-dimensional projective transformation

Published on 22 Mar 2026 - 18:27

1.1k

Views

Is there a possible geometric method to find length of this equilateral triangle?

Published on 23 Mar 2026 - 9:00

List Question

Find angle without trigonometry

Let E, F be points on the side AB of a triangle ABC. Prove that if ∠ECA = ∠BCF, then |AE||AF| / |BE||BF| = |AC|^2/|BC|^2

Apollonius special case.

Middle lines in octagon are congruent

Prove if $ABCD$ is a parallelogram, $\angle OBA = \angle ADO \iff \angle BOC = \angle AOD$

High school geometry problem: Reflect a vertex about opposite side.

Can't figure out this triangle geometry problem

Napoleon-like theorem concerning squares erected on sides of midpoint polygon of octagon

What is the radius and center of the image of $|z|=1$ under $ f(z) = \frac{3z+2}{4z+3}$?

Show that $MNPQ$ is a square

In acute $\triangle ABC$, show $DE+DF \leq BC$, where $D$, $E$, $F$ are the feet of the altitudes from $A$, $B$, $C$, respectively.

Intriguing geometry problem regarding isogonal lines

Nine-point circle - proof using plane geometry

Visualization of 2-dimensional projective transformation

Is there a possible geometric method to find length of this equilateral triangle?

Trending Questions

Popular # Hahtags

Popular Questions