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  2. geometry - Isosceles trapezoid with inscribed circle -...

    math.stackexchange.com/questions/1233465/isosceles-trapezoid-with-inscribed-circle

    1. Let the radius of the circle be r; then the height of the isosceles trapezoid is 2r, and the length of a lateral side would be 4r. The four right triangles with OB and OC as hypotenuses are congruent. The four right triangles with OA and OD as hypotenuses are also congruent. Therefore the lengths marked x are all the same, as are those marked y.

  3. Defining an Isosceles Trapezoid - Mathematics Stack Exchange

    math.stackexchange.com/questions/4940393/defining-an-isosceles-trapezoid

    A Trapezoid is a quadrilateral with at least one set of parallel sides. An Isosceles Trapezoid is a Trapezoid where the legs are of equal length. These definitions are called inclusive. This means that parallelograms (with two sets of parallel sides) are a type of trapezoid. What is the most formal and authoritative definition of an Isosceles ...

  4. geometry - Isosceles trapezoid - Mathematics Stack Exchange

    math.stackexchange.com/questions/27880/isosceles-trapezoid

    Since your trapezoid is isosceles, the two lower angles are the same. Therefore, the two diagonals are equal because the lower triangle each creates when dividing the trapezoid are congruent (by SAS). Then, by the Pythagorean theorem, as long as the two perpendiculars are not collinear, a> b + c a> b + c: Only when the two perpendiculars are ...

  5. geometry - Proving that a quadrilateral is an isosceles trapezoid...

    math.stackexchange.com/questions/4506778/proving-that-a-quadrilateral-is-an...

    A quadrilateral is an isosceles trapezoid if and only if the diagonals are congruent. And more specifically, Wikipedia's "Isosceles trapezoid" entry says: (An isosceles trapezoid is a) trapezoid in which both legs and both base angles are of equal measure. If necessary, assume that the diagonals bisect the base angles.

  6. Isosceles trapezoid with semicircle - Mathematics Stack Exchange

    math.stackexchange.com/questions/45411/isosceles-trapezoid-with-semicircle

    Trapezoid - A = (a+b/2)h and the area of the semicircle is 56.55. And yes the height is the radius of a semicircle, but I do not have the second base to calculate the area of the trapezoid. You might want to recheck the area of a trapezoid: A = 1 2 ⋅ h(a + b) A = 1 2 ⋅ h (a + b).

  7. How to bisect an isosceles trapezoid into two equal area parts

    math.stackexchange.com/questions/1876011/how-to-bisect-an-isosceles-trapezoid...

    Given an isosceles trapezoid: I want to draw a line parallel to the bases (that is, parallel to and in between AD and BC) such that the top half and the bottom half both have equal area. Specifically, if we define the height of the trapezoid as 1, I want to know how far from the longer base this bisector will fall. Let's call this value m.

  8. Height of an isosceles trapezoid - Mathematics Stack Exchange

    math.stackexchange.com/questions/2892760/height-of-an-isosceles-trapezoid

    Suppose we have an isosceles trapezoid whose length of the associated square is $20$ and the length of the hypotenuse of the triangles is $30$. I want to determine if it is possible to find the height of the triangles, I think no.

  9. Show that a trapezoid is cyclic if and only if it is isosceles

    math.stackexchange.com/questions/3967992/show-that-a-trapezoid-is-cyclic-if...

    Every isosceles trapezoid has an inscribed circle. 4. Cyclic quadrilateral and trapezoid. 1.

  10. Area of a trapezoid without the height - Mathematics Stack...

    math.stackexchange.com/questions/2019434/area-of-a-trapezoid-without-the-height

    How would I find the area of a non-iscoceles trapezoid and without the height? The trapezoid's bases are $30$ and $40$, and the legs $14$ and $16$. Thanks

  11. geometry - Given diagonals, lower base, and height, find the legs...

    math.stackexchange.com/questions/1626988/given-diagonals-lower-base-and-height...

    Given a known isosceles Trapezoid find height of another with same angles & one base but different area 0 Area of an isosceles triangle with height $7$ and perimeter $18+8\sqrt{2}$