Class 9 Science
Class 9 science important questions with answers pdf
NCERT Solutions Class 9 Science
NCERT questions of science class 9
Important questions Science NCER
Class 9 Study 2022-2023
NCERT Class 9 Science
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The angle of a prism is the measure of the inclination between two adjacent faces of the prism. In other words, it is the angle between two planes that intersect on a line that is perpendicular to both planes.
For better explanation see here.