Tangents An interior tangent of two circles Draw

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Tangents An interior tangent of two circles

Tangents An interior tangent of two circles

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

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

Take the radius of the smaller circle KEYWORDS: Internal Radius

Take the radius of the smaller circle KEYWORDS: Internal Radius

Add the smaller radius to the bigger circle 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.

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

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 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

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

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: Internal 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: Internal 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: Internal Diameter Radius Bisect

Transfer the tangent in parallel KEYWORDS: Internal Diameter Radius Bisect

Transfer the tangent in parallel KEYWORDS: Internal 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: Internal Diameter Radius Bisect

KEYWORDS: Internal Diameter Radius Bisect

KEYWORDS: Internal Diameter Radius Bisect

KEYWORDS: Internal Diameter Radius Bisect

KEYWORDS: Internal Diameter Radius Bisect

Let’s try a question Example 2: pg 188 Understanding Technical Graphics Construct an internal

Let’s try a question Example 2: pg 188 Understanding Technical Graphics Construct an internal tangent between these 2 circles KEYWORDS: Internal Diameter Radius Bisect

Let’s try a question Question 2: pg 189 Understanding Technical Graphics KEYWORDS: Internal Diameter

Let’s try a question Question 2: pg 189 Understanding Technical Graphics KEYWORDS: Internal Diameter Radius Bisect

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

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

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