Circles and Arcs:



Circles and Arcs:

The __Diameter_____ is the measurement across the circle passing through its center.

The __Radius______ is the measurement from the center out to the edge of the circle or arc.

The __Circumference_____ is the measurement of the length of the perimeter of the circle.

We will need to know how to measure circles and arcs for different applications in our 7th and 8th grade Technology classes. The measurements of drill bits, the sizes of wheels and pulley and our CAD drawings are just a few examples of how we will use them.

1. A circle with the radius of 2 inches has a diameter of _____4__inches.

2. A circle with the diameter of 6 inches has a radius of ______3___inches.

3. A circle with the radius of ½ inch has a diameter of _____1____inch.

4. A circle with the radius of 1 ½ inches has a diameter of _____3____inches.

5. A 3/ 8” drill bit is bigger than a 1/ 2” drill bit. True / False

We will be drawing circles and arcs using circle templates and a compass.

When using a compass you must set the distance for the radius of the circle.

When using a circle template you must use the diameter of the circle.

Angles and Geometry

We will be using many tools to draw accurately in our Technology class.

T-squares, triangles and protractors will be used to layout different angles.

1. A right angle measures ___90___degrees.

2. _______parallel_____lines are two lines that never intersect.

3.What is the measure of the 3rd angle of the following triangle? 90 degrees, 30 degrees &_60_degrees

4.What is the measure of the 3rd angle of the following triangle? 90 degrees, 45 degrees & _45_degrees

Types of Drawings

Layout and Measuring Tools

Linear Measurements

We will be using different types of measuring tools during our technology class.

-Plastic and wooden rulers are located in the wooden drawers on the side counter.

-Steel rules and tape measures are located in the back tool cabinet.

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Measurement =___1/2 _____

Measurement =__4 ½ ______

Measurement =____1/4 _____

Measurement =____2 ¾ _____

Measurement =____1/16 ____

Measurement =__3 7/8 _____

Name:______________

Period:_______

Circle template

Use marks to

allign

Multiview Drawing

Orthographic

Projection

Isometric

Drawing

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