Rhombus Facts All sides are equal. Lines AD and CB are called diagonals and always meet at right angles.Line AD is the long diagonal and line CB is the short diagonal. The diagonals bisect the vertex angles. Opposite angles are equal. Every rhombus has 2 acute and 2 obtuse angles. The altitude (or height) is perpendicular to sides AB & CD.
Area Formulas Rhombus Area = side • altitude Rhombus Area = side² • sin (α or β)
All rhombuses are tangential quadrilaterals, meaning that they are 4 sided figures into which a circle (called an incircle) can be inscribed such that each of the four sides will touch the circle at only one point. (Basically, this means that the circle is tangent to each of the four sides of the rhombus.)
To inscribe a circle
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