Fencing off a square area that has length and width of 20 inches area to plot a crop. Since fences
cost money you do not want to buy any extra thus you would want to calculate the perimeter of
the area.Perimeter is 20+20+20+20= 80 inches. 80inch
Unit: Area and Perimeter
Lesson: Circumference of Circles
Teacher: Lisa Bubello
Grade: 6th grade GEM or Advanced
Classroom Layout: Group setting (3 to 5 students)
Prerequisite Knowledge for Students: GeoGebra
Prerequisite Knowledge for teachers: Power Poi
Circles: circumference and area worksheet
Circumference x diameter
Circumference 2 x x radius
Area x radius x radius
Use 3.14 to answer these questions
State your answers accurate to one decimal place
1. Find the circumference of a circle of radius:
CIRCUMFERENCE AND AREA OF A CIRCLE
You already know that the diameter of a circle is twice the radius. So given the radius or
diameter, you can find the other.
1. The radius is 12cm. What is the diameter?
2. The diameter is 30 in. What is the radius?
Formulas - Perimeter, Circumference, Area, Surface Area, Volume - of 2D and 3D Shapes
2D geometric shape: square, rectangle, triangle, circle, trapezoid, parallelogram, etc.
composite figure: a combination of 2 or more geometric shapes
3D geometric shape:
is the symbol used for this special number Pi is its name (Say it as `pie')
comes from working with circles.
is the ratio of the circumference of a circle to its diameter.
This means that you can work out by dividing distance around a
circle by the len
Shape and Space
The value of
For any circle the circumference is always just over
three times bigger than the radius.
The exact number is called (pi).
We use the symbol because the number cannot be written
A circle is a shape with all points the
same distance from its center.
The distance around a circle is called
The distance across a circle through
its center is called its diameter.
(pi) is the ratio of the
circumference of a c
Perimeter, Area, Circumference Test
Directions: Read each question carefully. Choose the correct
What is the perimeter of this figure?
What is the perimeter of a rectangle t
Area, Perimeter and Circumference Review WS
Fill in each blank with the correct formula.
the area of a circle:
A = _
the area of a triangle:
A = _
the area of a parallelogram:
A = _
the circumference of a circle:
C = _
Find the area and perime
List each of the following for circle Q.
1. three radii
2. one diameter
3. two chords
Find the unknown length for a circle with the given dimension.
4. r = 35 mi , d = _
5. d = 6.8 yd , r = _
6. r = 18 ft , d = _
Geometry : 2/9/12 : Name:- Pd:-Practice worksheet on the radius, diameter, circumference,
and area of a circle
Circumference C =
2) Diameter, d = 2r
and radius ,
3) Area of a circle , A = r2
-1) . The radius of a circle is 5 inches. Wha
Name: Mickel Alexander
Table of Contents
This project gives a details explanation of Triangles,
Quadrilaterals and Circles including the different types of
triangles and their characteristics and properties; the types of
CIRCUMFERENCE AND AREA OF CIRCLES
When working with circles, we need to be aware of a couple of vocabulary words that are
unique to circles.
RADIUS & DIAMETER
RADIUS refers to the distance from the center of a circle to its edge. Its plural
Examples of Area of Shapes
Area of a Triangle
The area of a triangle is base height. For example the peak of a roof is a triangle that has a
base of 30cm and a height of 20 cm. The area of the roof is 30 20 which is 300 cm.
Area of a Square
The area of a
How to calculate the
area of a circle.
Its as easy as pi.
Lets first make sure that we
understand the difference
between circumference and
The circumference of a circle
is the perimeter of the circle.
Imagine that the circle is