Question

Can $\pi$ be approximated by considering polygons with increasing number of sides, but without using circles or trigonometry?

score 587 · Answer 1 · 2026-03-26 22:57:54

587

Views

Can $\pi$ be approximated by considering polygons with increasing number of sides, but without using circles or trigonometry?

Published on 26 Mar 2026 - 22:57

score 14 · Answer 2 · 2026-02-23 02:46:06

14

Views

What happens to a rectangle triangle if I divide per 2 a side length?

Published on 23 Feb 2026 - 2:46

score 84 · Answer 3 · 2020-05-26 14:37:16

84

Views

What is the inradius of a $5$-$6$-$9$ triangle?

Published on 26 May 2020 - 14:37

score 75 · Answer 4 · 2020-05-26 15:02:13

75

Views

Prove that A₁D, B₁E, C₁F intersect at the same point

Published on 26 May 2020 - 15:02

score 48 · Answer 5 · 2020-05-26 22:48:11

48

Views

Need help understanding statement "By linear algebra we know $\left|A,B,C\right|=-(A\times C)\cdot B=-(C\times B)\cdot A$

Published on 26 May 2020 - 22:48

score 99 · Answer 6 · 2026-02-23 08:34:16

99

Views

In a triangle, G is the centroid of triangle ADC. AE is perpendicular to FC. BD = DC and AC = 12. Find AB.

Published on 23 Feb 2026 - 8:34

score 134 · Answer 7 · 2020-05-27 06:13:10

134

Views

Prove that $∡ADI=90°$

Published on 27 May 2020 - 6:13

score 70 · Answer 8 · 2026-04-03 22:28:47

70

Views

Finding the hypotenuse of a triangle using angles and segment lengths.

Published on 03 Apr 2026 - 22:28

score 45 · Answer 9 · 2020-05-28 11:41:34

45

Views

Can I make this assumption?

Published on 28 May 2020 - 11:41

score 43 · Answer 10 · 2020-05-28 13:19:02

43

Views

Find the shaded area, given the sides:

Published on 28 May 2020 - 13:19

score 258 · Answer 11 · 2020-05-28 18:47:35

258

Views

Finding triangle side lengths given altitudes or lengths of sectioned triangles within triangle.

Published on 28 May 2020 - 18:47

score 95 · Answer 12 · 2020-05-28 19:43:53

95

Views

Prove that the area of the triangle formed by the centers of the circumferences ex-inscribed is $\frac{abc}{2r}$

Published on 28 May 2020 - 19:43

score 357 · Answer 13 · 2026-03-26 22:18:15

357

Views

Number of isoceles triangles formed by the vertices of a polygon that are not equilateral

Published on 26 Mar 2026 - 22:18

score 66 · Answer 14 · 2020-05-29 17:27:20

66

Views

Solving for side lengths of a triangle given specific conditions.

Published on 29 May 2020 - 17:27

score 79 · Answer 15 · 2020-05-29 17:49:16

79

Views

For angles $A$ and $B$ in a triangle, is $\cos\frac B2-\cos \frac A2=\cos B-\cos A$ enough to conclude that $A=B$?

Published on 29 May 2020 - 17:49

List Question

Can $\pi$ be approximated by considering polygons with increasing number of sides, but without using circles or trigonometry?

What happens to a rectangle triangle if I divide per 2 a side length?

What is the inradius of a $5$-$6$-$9$ triangle?

Prove that A₁D, B₁E, C₁F intersect at the same point

Need help understanding statement "By linear algebra we know $\left|A,B,C\right|=-(A\times C)\cdot B=-(C\times B)\cdot A$

In a triangle, G is the centroid of triangle ADC. AE is perpendicular to FC. BD = DC and AC = 12. Find AB.

Prove that $∡ADI=90°$

Finding the hypotenuse of a triangle using angles and segment lengths.

Can I make this assumption?

Find the shaded area, given the sides:

Finding triangle side lengths given altitudes or lengths of sectioned triangles within triangle.

Prove that the area of the triangle formed by the centers of the circumferences ex-inscribed is $\frac{abc}{2r}$

Number of isoceles triangles formed by the vertices of a polygon that are not equilateral

Solving for side lengths of a triangle given specific conditions.

For angles $A$ and $B$ in a triangle, is $\cos\frac B2-\cos \frac A2=\cos B-\cos A$ enough to conclude that $A=B$?

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