An interior tangent of two circles Tangents

Author : tawny-fly | Published Date : 2025-05-12

Description: An interior tangent of two circles Tangents KEYWORDS Draw on the whiteboard what you think an INTERNAL tangent would look like Take the radius of the smaller circle KEYWORDS Internal Radius KEYWORDS Internal Radius Add the smaller radius

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Transcript:An interior tangent of two circles Tangents:
An interior tangent of two circles Tangents KEYWORDS Draw on the whiteboard what you think an INTERNAL tangent would look like Take the radius of the smaller circle KEYWORDS: Internal Radius KEYWORDS: Internal Radius Add the smaller radius to the bigger circle KEYWORDS: Internal Radius For internal tangents always add the small circles radius to the bigger circles radius. This is so you are now constructing a tangent from a point to a circle KEYWORDS: Internal Radius Now that the smaller circle has been reduced to a point, join that point to the centre of the new circle (same) KEYWORDS: Internal Radius Bisect Bisect line that joins the point to the circle KEYWORDS: Internal Radius Bisect Bisect line that joins the point to the circle KEYWORDS: Internal Radius Bisect Bisect line that joins the point to the circle KEYWORDS: Internal Radius Bisect Diameter Construct a semi-circle with the diameter from the centre of the circle to the point P KEYWORDS: Internal Radius Bisect Diameter Base Apex Always construct a triangle in the semi-circle with the diameter as the base and apex where the circle intersects the semi-circle. KEYWORDS: Internal Radius Bisect Diameter Base Apex Always construct a triangle in the semi-circle with the diameter as the base and apex where the circle intersects the semi-circle. From the principle of constructing a triangle in a semi-circle you know that the apex angle is 90 degrees KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Transfer the tangent in parallel KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Point of Contact Find other POC by constructing a line at 90 degrees to the tangent through the centre KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Point of Contact KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Point of Contact KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Point of Contact Let’s try a question Construct an internal tangent between these 2 circles Example 2: pg 188 Understanding Technical Graphics KEYWORDS: Internal Radius Bisect Diameter Base Apex Parallel Point of Contact Let’s try a question Question 2: pg 189 Understanding Technical Graphics Let’s make definitions for our keywords Internal Radius Bisect Diameter Base Apex Parallel Point of Contact

An interior tangent of two circles Tangents

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