Tangents An external tangent of two circles Draw

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Tangents An external tangent of two circles

Tangents An external tangent of two circles

Draw on the whiteboard what you think an EXTERNAL tangent would look like KEYWORDS

Draw on the whiteboard what you think an EXTERNAL tangent would look like KEYWORDS

Take the radius of the smaller circle KEYWORDS: External Radius

Take the radius of the smaller circle KEYWORDS: External Radius

Add the smaller radius to the bigger circle KEYWORDS: External Radius

Add the smaller radius to the bigger circle KEYWORDS: External Radius

For external tangents always subtract the small circles radius from the bigger circles radius.

For external tangents always subtract the small circles radius from the bigger circles radius. This is so you are now constructing a tangent from a point to a circle KEYWORDS: External Radius

Now that the smaller circle has been reduced to a point, join that point

Now that the smaller circle has been reduced to a point, join that point to the centre of the new circle (same) KEYWORDS: External Radius

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Bisect line that joins the point to the circle KEYWORDS: External Radius Bisect

Construct a semi-circle with the diameter from the centre of the circle to the

Construct a semi-circle with the diameter from the centre of the circle to the point P KEYWORDS: External Diameter Radius Bisect

Always construct a triangle in the semi-circle with the diameter as the base and

Always construct a triangle in the semi-circle with the diameter as the base and apex where the circle intersects the semi-circle. KEYWORDS: External Diameter Radius Bisect

Always construct a triangle in the semi-circle with the diameter as the base and

Always construct a triangle in the semi-circle with the diameter as the base and apex where the circle intersects the semi-circle. ing t c u r onst c f you o e e l l c p r inci i-ci r m p e s 90 i e s h t e l a ang From ngle in x e ap a a tri that the know s ee degr KEYWORDS: External Diameter Radius Bisect

Transfer the tangent out parallel and extend the normal KEYWORDS: External Diameter Radius Bisect

Transfer the tangent out parallel and extend the normal KEYWORDS: External Diameter Radius Bisect

Transfer the tangent out parallel and extend the normal KEYWORDS: External Diameter Radius Bisect

Transfer the tangent out parallel and extend the normal KEYWORDS: External Diameter Radius Bisect

Find other POC by constructing a line at 90 degrees to the tangent through

Find other POC by constructing a line at 90 degrees to the tangent through the centre KEYWORDS: External Diameter Radius Bisect

KEYWORDS: External Diameter Radius Bisect

KEYWORDS: External Diameter Radius Bisect

KEYWORDS: External Diameter Radius Bisect

KEYWORDS: External Diameter Radius Bisect

Let’s try a question Example 1: pg 188 Understanding Technical Graphics KEYWORDS: External Diameter

Let’s try a question Example 1: pg 188 Understanding Technical Graphics KEYWORDS: External Diameter Radius Bisect

Let’s try another one Question 1: pg 189 (Soap Dispenser) Understanding Technical Graphics KEYWORDS:

Let’s try another one Question 1: pg 189 (Soap Dispenser) Understanding Technical Graphics KEYWORDS: External Diameter Radius Bisect

Let’s make definitions for our keywords • • External Radius Bisect Diameter Base Apex

Let’s make definitions for our keywords • • External Radius Bisect Diameter Base Apex Parallel Point of Contact

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