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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