Question

Prove that the area of a triangle with inradius $r$ equals $2r(\sin A+\sin B+\sin C)$

score 34 · Answer 1 · 2020-02-09 08:24:52

34

Views

Prove that the area of a triangle with inradius $r$ equals $2r(\sin A+\sin B+\sin C)$

Published on 09 Feb 2020 - 8:24

score 73 · Answer 2 · 2026-03-25 22:06:15

73

Views

How to find the area of the red-colored enclosure?

Published on 25 Mar 2026 - 22:06

score 116 · Answer 3 · 2026-03-26 14:22:55

116

Views

Geometry Problem: In Triangle ABC, draw a perpendicular on line BC such that Area of ABXY is equal to Area of XYC

Published on 26 Mar 2026 - 14:22

score 741 · Answer 4 · 2020-02-10 10:34:41

741

Views

Area of Trapezoid by adding a triangle on top

Published on 10 Feb 2020 - 10:34

score 43 · Answer 5 · 2026-03-28 12:14:49

43

Views

Length of line perpendicular to $\overline{AB}$ ($A = (0, y_1)$, $B = (x_1, 0)$) intersecting $AB$ at $1/5$ its length, and y axis at $(0, y_2)$

Published on 28 Mar 2026 - 12:14

score 64 · Answer 6 · 2026-03-28 10:35:18

64

Views

Solve for the radius of smaller circle in this image.

Published on 28 Mar 2026 - 10:35

score 354 · Answer 7 · 2020-02-15 05:24:48

354

Views

Find the distance covered by a corner of the plate in one revolution round the fixed plate.

Published on 15 Feb 2020 - 5:24

score 125 · Answer 8 · 2026-03-26 04:29:28

125

Views

Is there a primitive Heronian triangle with two integer heights?

Published on 26 Mar 2026 - 4:29

score 55 · Answer 9 · 2020-02-16 17:28:46

55

Views

An angle inside an ISOSCELES triangle - Challenge

Published on 16 Feb 2020 - 17:28

score 161 · Answer 10 · 2026-03-26 08:14:59

161

Views

Prove that $m_a\geq \dfrac{b^2+c^2}{4R}$

Published on 26 Mar 2026 - 8:14

score 129 · Answer 11 · 2026-02-23 01:04:10

129

Views

Probability of forming a triangle from a unit line segment with two random cuts

Published on 23 Feb 2026 - 1:04

score 242 · Answer 12 · 2026-03-25 23:09:05

242

Views

Area of a quadrilateral inside a right angled triangle

Published on 25 Mar 2026 - 23:09

score 181 · Answer 13 · 2020-02-18 13:37:15

181

Views

Prove that QA is perpendicular to simson line of P

Published on 18 Feb 2020 - 13:37

score 133 · Answer 14 · 2020-02-18 22:04:54

133

Views

Show that $m(\angle ABM)=30^{\circ}$.

Published on 18 Feb 2020 - 22:04

score 34 · Answer 15 · 2020-02-19 16:39:28

34

Views

In $\Delta ABC$ prove that $\frac{a-b\cos C}{b-a\cos C}=\frac{\cos B}{\cos A}$

Published on 19 Feb 2020 - 16:39

List Question

Prove that the area of a triangle with inradius $r$ equals $2r(\sin A+\sin B+\sin C)$

How to find the area of the red-colored enclosure?

Geometry Problem: In Triangle ABC, draw a perpendicular on line BC such that Area of ABXY is equal to Area of XYC

Area of Trapezoid by adding a triangle on top

Length of line perpendicular to $\overline{AB}$ ($A = (0, y_1)$, $B = (x_1, 0)$) intersecting $AB$ at $1/5$ its length, and y axis at $(0, y_2)$

Solve for the radius of smaller circle in this image.

Find the distance covered by a corner of the plate in one revolution round the fixed plate.

Is there a primitive Heronian triangle with two integer heights?

An angle inside an ISOSCELES triangle - Challenge

Prove that $m_a\geq \dfrac{b^2+c^2}{4R}$

Probability of forming a triangle from a unit line segment with two random cuts

Area of a quadrilateral inside a right angled triangle

Prove that QA is perpendicular to simson line of P

Show that $m(\angle ABM)=30^{\circ}$.

In $\Delta ABC$ prove that $\frac{a-b\cos C}{b-a\cos C}=\frac{\cos B}{\cos A}$

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