Definitions
Area
Properties of Circles
Finding the Area of a Circle
100
What is the definition of Area?
a measure of the region needed to cover a surface
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 is area always measured?
The basic unit of area in the metric system is the square meter
200
What goes straight across the circle, through the center
Diameter
200
What is the formula for finding the Area of a rectangle?
Area = w × h
200
D stands for ?
Diameter
goes straight across the circle, through the center.
200
What is the formula used to find the area of a circle?
A = π r 2
300
What is the distance once around the circle
Circumference
300
How do you find the area of a parallelogram? (formula)
A=b*h
300
What is circumference
is the distance once around the circle
300
What is the area of a circle with radius of 1.2 m ?
Area= πr2
= π × 1.22
= 3.14159... × (1.2 × 1.2)
= 4.52 (to 2 decimals)
400
Half the diameter is called
radius
400
How do you find the Area of a trapezoid? (formula)
Area = a+b2 × h
400
When we divide the circumference by the diameter we get?
3.141592654...
which is the number π (Pi)
400
What is the area of a circle with radius of 3 m ?
A=28.26 in
500
the formula for area of a circle
Pi(r^2)
500
What is the Formula for the area of a circle?
A=π r 2
500
When the diameter is 1 what is the circumference?
the circumference is 3.141592654
500
The diameter of a circle is 8 centimeters. What is the area of the circle?
A = 50.24 cm