New posts in triangles

Find angle UFO in the picture attached

geometry trigonometry euclidean-geometry triangles plane-geometry

proving the inequality $\triangle\leq \frac{1}{4}\sqrt{(a+b+c)\cdot abc}$

inequality triangles

Finding the shaded area in a triangle

geometry triangles

How to find area of triangle from its medians

geometry trigonometry triangles

Is there a way to solve for the missing angle?

geometry triangles polygons

Wanted : for more formulas to find the area of a triangle?

geometry trigonometry triangles area reference-works

Can one deduce whether a given quantity is possible as the area of a triangle when supplied with the length of two of its sides?

geometry triangles

How to prove that perpendicular from right angled vertex to the hypotenuse is at most half the length of hypotenuse of a right triangle?

calculus geometry trigonometry triangles

Status of The Triangle Book [closed]

geometry reference-request triangles

How to calculate the area covered by any spherical rectangle?

geometry trigonometry triangles area spherical-geometry

Do there exist an infinite number of 'rational' points in the equilateral triangle $ABC$?

geometry euclidean-geometry triangles rational-numbers

Any way to solve this right angle triangle problem without trig? [duplicate]

geometry triangles recreational-mathematics

Vector path length of a hypotenuse

geometry triangles

Of all polygons inscribed in a given circle which one has the maximum sum of squares of side lengths?

euclidean-geometry triangles

How to find the third coordinate of a right triangle given 2 coordinates and lengths of each side

geometry computational-geometry triangles

How to calculate the radius of the curved side of a triangle?

geometry triangles circles

How is $\sin 90° = 1$ possible?

functions trigonometry triangles ratio

Solving Triangles (finding missing sides/angles given 3 sides/angles)

geometry algebra-precalculus trigonometry euclidean-geometry triangles

How do I prove that $\left( 1-\frac{a}{b} \right)\left( 1+\frac{c}{d} \right)=4$?

geometry trigonometry triangles

prove that the intersection of the two lines $l_1$ and $l_2$ is concyclic with midpoints of three sides of a triangle

geometry euclidean-geometry triangles