Definitions
Area
Properties of Circles
Finding the Circumference of a Circle
Finding the Area of a Circle
100
It is half the diameter of a circle.
radius
100
Is the area the same formula for all shapes?
No
100
R stands for?
Radius
is the distance from the center outwards
100
How do you find the circumference of a circle?
Circumference = π × Diameter
C=2πr
100
What is the formula used to find the area of a circle?
A = π r 2
200
What goes straight across the circle, through the center?
Diameter
200
What is the formula for finding the Area of a rectangle?
Area = length x width
200
D stands for ?
Diameter
goes straight across the circle, through the center.
200
To find the circumference of a circle that gives me the radius what formula should I use?
Circumference = 2 × π × Radius
200
What is the area of a circle if r = 7 cm ?
154 cm2
300
What is the distance once around the circle
Circumference
300
How do you find the area of a parallelogram? (formula)
A=b x h
300
What is the decimal value of pi?
3.14
300
What is the circumference of a circle whose diameter is 8/2 ?
C=π⋅ 8/2
C=22/7⋅8/2
C=88/7 OR
C≈12 4/7 units
300
What is the area of a circle with radius of 10 m ?
Area= πr2
= 314 m2
400
The 'pizza' slice is called a
Sector
400
What is the circumference formula?
C = π x d
400
When we divide the circumference by the diameter we get?
3.141592654...
which is the number π (Pi)
400
What is the circumference of a circle with a radius of 15 cm ?
Circumference=2π⋅radius
=2π⋅15
=π⋅30
=94.2 cm
400
What is the area of a circle with radius of 3 m ?
A=28.26 in2
500
The slice made by a chord is called a
Segments
500
What is the Formula for the area of a circle?
A=π x r 2
500
When the diameter is 1 what is the circumference?
the circumference is 3.141592654
500
What is the circle's circumference, with a radius of 9 in?
Circumference=2π⋅radius
=2π⋅9
=18π
=56.52 in
500
The diameter of a circle is 8 centimeters. What is the area of the circle?
A = 50.24 cm2