Definition
Application
Problem-solving
Extention
100
Define a circle
Circle is formed by all the points that have the same distance from the center.
100
Give an example of how you use circles in a machine.
All the gears are circles.
100
If the diameter of circle A is 10 cm, what is its radius?
5 cm
100
Give an example of when a circle looks like a straight line?
As we see the earth on the earth.
200
Define diameter.
Diameter is the chord that goes through the center of a circle.
200
How would you measure the circumference of a circular jar?
I will use a string and ruler.....
200
What is the area of circle A if its diameter is 20 feet?
314 square feet
200
Why is it 360 degrees for a whole circle?
360 is a number that can have more different factors.
300
Define tangent line.
It is a line that touches a circle from the outside by exact one point.
300
What would the world be like with the first application of circles?
We would not be able to move heavy objects so easily as now.
300
A goal is tied up to a post with a 10-foot rope on a lawn. What is the shape formed by it grazing to its longest possible distance?
A circle
300
How would you measure the distance of the bank of a lake?
Use a measuring wheel.
400
Define Chord
A chord is a line segment that both endpoints are on the circumference of a circle.
400
Which gives more or the same area, a square with a side of 10 feet or a circle with a radius of 10 feet? And why?
The circle does.
400
What is the largest area for a goat tied-up to a post with a 10-foot rope, grazing on an open field?
25 Pi square feet
400
How was Pi defined?
Pi is the ratio of the circumference to its diameter.
500
What is the formula to find the area of a circle?
A = Pi (Radius to the 2nd power)
500
How does a measuring wheel work?
By rolling the wheel, it is using the circumference to generate the reading on the display.
500
Give an example of how circles are used in daily life.
Wheels, tires, ....
500
What is the angle measure of a semicircle?
180 degrees
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