Full Definition of DUSKY. 1. : somewhat dark in color; specifically: having dark skin. 2. : marked by slight or deficient light: shadowy. â duskÂ·iÂ·ly \-kÉ-lÄ\ adverb. â duskÂ·iÂ·ness \-kÄ-nÉs\ noun. See dusky defined for English-language learners.See dusky defined for kids. ADVERTISEMENT.ull Definition of DUSKY. 1. : somewhat dark in color; specifically: having dark skin. 2. : marked by slight or deficient light: shadowy. â duskÂ·iÂ·ly \-kÉ-lÄ\ adverb. â duskÂ·iÂ·ness \-kÄ-nÉs\ noun. See dusky defined for English-language learners. See dusky defined for kids.
A prism is a three-dimensional figure with two parallel congruent faces, called bases, and lateral faces in the shape of parallelograms. Prisms are named according to the shape of their bases. A prism whose bases and lateral faces are rectangles. A rectangular prism whose faces are squares. A three-dimensional shape with two parallel congruent circular faces whose cross sections (taken parallel to these circular faces) are circular. A cone is like a pyramid with a circular base.
Ask:Which solid figures have faces that are polygons? (rectangular prism, cube, and pyramid) Say:Put the other solid figures aside for now. Ask:Which solid figure has faces that are rectangles? (rectangular prism) Say:Count the number of faces a rectangular prism has. Mark an X on each face as you count. Copy this table on the board as students are working. Ask:How many faces does a rectangular prism have? (6) Record 6 on the table. Say:The line segment where two faces meet is an edge. Count the number of edges a rectangular prism has. Mark an X on each edge as you count. Ask:How many edges does a rectangular prism have? (12) Record 12 on the table. Say:The point where edges meet is a vertex.