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Deltoid, kite concave, dart, arrowhead - diagonals, area, perimeter, sides- Online calculators - Calcoolator.eu
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Concave kite four-body configurations with three equal masses m1=m2=m3. | Download Scientific Diagram
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Convex & Concave Quadrilaterals | Overview, Examples & Attributes - Video & Lesson Transcript | Study.com
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