In Euclidean geometry, an isosceles trapezoid (isosceles trapezium) is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides. It is a special case of a trapezoid. Alternatively, it can be defined as a trapezoid in which both legs and both base angles are of the same measure.

Bases of Trapezoid: a,b

Leg: c

Midline: q

Altitude: h

Diagonal: D

Radius of circumscribed circle: R

Area: S

- $q={a+b}/2$
- $d=ā{ab+c^2}$
- $h=ā{c^2-1/4(b-a)^2}$
- $R={cā{ab+c^2}}/ā{(2c-a+b)(2c+a-b)}$
- $S={a+b}/2\ h=qh$

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