Circle Terms
Finding Circumference
Finding Area
Parts of a Circle
100
The distance from the center of a circle to the outside, also half of the diameter
What is radius
100
What is the circumference of a circle with a diameter of 10 inches? Use 3.14 <MUST INCLUDE UNITS>
31.4 inches
100
What is the area of a circle with a radius of 10 inches? Use 3.14 <MUST INCLUDE UNITS>
10*10*3.14 = 314 units2
100
Is there a proportional relationship between the radius and the diameter? If so, write an equation.
Yes, there is a relationship.
R = 1/2d
D = 2r
200
The longest part in a circle. From one edge to the other through the center.
What is the Diameter
200
What is the circumference of a circle with a radius of 18 feet? Use 3.14 <MUST INCLUDE UNITS>
116.18 feet
200
What is the area of a circle with a diameter of 5 inches? Use 3.14 <MUST INCLUDE UNITS>
2.5*2.5*3.14 = 19.625 cm2
200
Is there a proportional relationship between the diameter and the circumference?
If so, write TWO equations.
Yes there is a proportional relationship.
C=3.14d
D= 1/3.14c
Use the exact pi symbol is also correct.
300
The distance around the circle.
What is circumference?
300
Find the circumference of this shape.
<MUST INCLUDE UNITS>
C = d*3.14
C = 6*3.14= 18.84 + 8 + 8 = 34.84 cm
300
Find the Area of this shape.
<MUST INCLUDE UNITS>
Rectangle: 6*8 = 48 cm2
Circle: 3*3*3.14= 28.26 cm2
76.26 cm2
300
What is pi?
Pi is an irrational number that represents the exact relationship or COP between the diameter and the circumference
400
Which part of a circle does the full rotation of a circular wheel relates to and why?
The circumference because the the circumference represents the total distance around a shape.
400
Find the circumference of this shape.
<MUST INCLUDE UNITS>
7 + 12 + 7 + 1/2(12*3.14)
44.84 cm
400
Find the area of this shape.
<MUST INCLUDE UNITS>
Rectangle: 7*12 = 84 cm2
Semi-circle: 1/2 (6*6*3.14) = 56.52 cm2
56.52 + 84 = 140.52 cm2
400
Is there a proportional relationship between the radius and the circumference?
If so, explain the relationship.
Yes there is a relationship because
C=3.14d
D=2r
so C= 3.14*2r or C = 6.28r
500
**DAILY DOUBLE**
Name FOUR characteristics of a circle
Circles are 1. round, 2. closed, 3. 2-dimensional shapes with 4. equal distance all around.
500
**DAILY DOUBLE**
Find the circumference of this shape.
<MUST INCLUDE UNITS>
6+7+ 16+ 7 + 1/2(10*3.14) = 51.7 cm
500
**DAILY DOUBLE**
Find the Area of this shape.
<MUST INCLUDE UNITS>
Rectangle: 7*16= 112 cm2
Circle: 1/2(5*5*3.14) = 39.25 cm2
151.25 cm2
500
**DAILY DOUBLE**
What is the area of the shaded region in terms of pi?
Large circle: 5*5*pi = 25pi
Medium circle: 3*3*pi = 9pi
Small circle: 2*2*pi= 4pi
25pi - 9pi - 4 pi = 12 pi