Mathomat V3

# How to Join Two Points when its Ruler isn't Long Enough

video tutorial part
15
of

## Learning Geometry with a Circle Arc Template

with

### Chris Tisdell

Mathematician & Educator

### Materials you will need:

Mathomat V3 Template
Unlined Paper / Scrap Paper
Sharp Pencil/s
Fine-point Pen/s
Eraser

### What you will learn in this tutorial:

The video begins with Chris Tisdell introducing the topic of geometric constructions using a circle arc template and a straight edge. He mentions that the straight edge has a limited length and focuses on the challenge of joining two points when the straight edge is not long enough.

Chris starts by showing a construction involving parallel lines and midpoints from previous videos. Then, he introduces a new problem: connecting two points, B and C, with a limited-length straight edge. He illustrates how to approach this problem step by step.

1. He starts by drawing a line segment fromB to a point A, and from C to another point A, such that the length of the straight edge matches the radius of a circle arc template.
2. The challenge is to connect B and C using this limited-length straight edge. To solve this, Chris constructs a parallelogram by bisecting line segment AB at point D and drawing parallell ines through D and A.
3. He extends the parallel lines to intersect, creating point E, which is the midpoint of line segment AB.
4. Chris repeats the process for line segment AC, constructing a parallelogram with point F as the midpoint of line segment AC.
5. Now, he has two midpoints, E and F, and can connect them to form line segment EF, which intersects line segment BC at point G. This intersection point allows him to join points B and C with a shorter line segment.
6. Chris repeats this process for various points on BC, creating more midpoints, and eventually connecting all the points to form a segmented line that connects B and C.
7. He demonstrates the construction steps using different colours to distinguish the segments.
8. Chris explains that this process can be repeated as needed, allowing the connection of two points even with a limited-length straight edge.

In summary, Chris Tisdell's video discusses the problem of connecting two points with a limited-length straight edge in geometric constructions. He demonstrates a step-by-step solution involving the construction of midpoints and the use of parallelograms, ultimately connecting the points successfully. The video provides a practical approach to overcoming this geometric challenge.

### Chris Tisdell

Mathematician & Educator
Chris, a mathematician and educator, is an academic advisor to Mathomat. Chris approached us in 2021 with an interest in the circle templates in Mathomat...
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