Kaleigh Cook Acute Triangle A triangle for which all interior angles are acute. Circle A locus of all points that are a fixed distance from a given point. Cone A three dimensional figure with a simple base tapered to an apex. Cube A regular polyhedron for which all faces are squares. Cylinder A three dimensional geometric figure with parallel congruent bases. Flip or Reflection A transformation in which a geometric figure is reflected across a line. Horizontal Perfectly flat and level. Kite A quadrilateral with two pairs of adjacent sides that are congruent. Lateral Surface Area The surface area of the lateral surfaces of a solid. Octagon A polygon with eight sides. Ellipse A conic section which is essentially a stretched circle. Perpendicular Lines Intersecting lines that form 90 degree angles Pyramid A polyhedron with a polygonal base and lateral surfaces that taper to an apex. Rectangle A box shape on a plane. Right Triangle A triangle which has a right (90 degree) interior angle. Semi Circle Half of a circle that has a 180 degree arc.