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  2. Sum of angles of a triangle - Wikipedia

    en.wikipedia.org/wiki/Sum_of_angles_of_a_triangle

    An easy formula for these properties is that in any three points in any shape, there is a triangle formed. Triangle ABC (example) has 3 points, and therefore, three angles; angle A, angle B, and angle C. Angle A, B, and C will always, when put together, will form 360 degrees. So, ∠A + ∠B + ∠C = 360°

  3. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    An exterior angle of a triangle is an angle that is a linear pair (and hence supplementary) to an interior angle. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two interior angles that are not adjacent to it; this is the exterior angle theorem. [34]

  4. Internal and external angles - Wikipedia

    en.wikipedia.org/wiki/Internal_and_external_angles

    The interior angle concept can be extended in a consistent way to crossed polygons such as star polygons by using the concept of directed angles.In general, the interior angle sum in degrees of any closed polygon, including crossed (self-intersecting) ones, is then given by 180(n–2k)°, where n is the number of vertices, and the strictly positive integer k is the number of total (360 ...

  5. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    The angles of proper spherical triangles are (by convention) less than π, so that < + + < (Todhunter, [1] Art.22,32). In particular, the sum of the angles of a spherical triangle is strictly greater than the sum of the angles of a triangle defined on the Euclidean plane, which is always exactly π radians.

  6. Modern triangle geometry - Wikipedia

    en.wikipedia.org/wiki/Modern_triangle_geometry

    The triangle DEF is called the pedal triangle of P. [17] The antipedal triangle of P is the triangle formed by the lines through A, B, C perpendicular to PA, PB, PC respectively. Two points P and Q are called counter points if the pedal triangle of P is homothetic to the antipedal triangle of Q and the pedal triangle of Q is homothetic to the ...

  7. Inscribed angle - Wikipedia

    en.wikipedia.org/wiki/Inscribed_angle

    Inside each isosceles triangle the pair of base angles are equal to each other, and are half of 180° minus the apex angle at the circle's center. Adding up these isosceles base angles yields the theorem, namely that the inscribed angle, ψ, is half the central angle, θ.

  8. Ideal triangle - Wikipedia

    en.wikipedia.org/wiki/Ideal_triangle

    A circle with radius d around a point inside the triangle will meet or intersect at least two sides of the triangle. The distance from any point on a side of the triangle to another side of the triangle is equal or less than a = ln ⁡ ( 1 + 2 ) ≈ 0.881 {\displaystyle a=\ln \left(1+{\sqrt {2}}\right)\approx 0.881} , with equality only for the ...

  9. Triangle center - Wikipedia

    en.wikipedia.org/wiki/Triangle_center

    Triangle centers that have the same form for both Euclidean and hyperbolic geometry can be expressed using gyrotrigonometry. [11] [12] [13] In non-Euclidean geometry, the assumption that the interior angles of the triangle sum to 180 degrees must be discarded.