Compound - Made up of more than one thing , Radius - A straight line from the centre to the circumference of a circle or sphere, Diameter - A straight line passing from side to side through the centre of a circle or sphere, Circumference - The distance around the outside of a circle (perimeter) , Semi Circle - Half a circle , Sector - A part of a circle made of the arc of the circle along with its two radii, Segment - The region enclosed by a chord and the corresponding arc, Quadrant  - A quarter of a circle , Chord - A straight line segment whose endpoints both lie on a circular arc, Face - The surface of a solid , Edge - The outside line of a shape, Vertex - The corner of a shape, Prism - A solid object with two identical ends and flat sides, Cross section - A surface or shape exposed by making a straight cut through a 3D shape, Hypotenuse  - The longest side of a right-angled triangle, opposite the right angle., Apex  - The top or highest point of a shape ,

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