circle area
circle cicumferece
composite area
composite perimeter
angles
vocabulary and formulas
100
What is the area of a circle with a radius of 1? 
pi
100
What is the circumference of a circle with a diameter of 1? 
c=pid =pi(1) = pi = 3.14
100
What is the area of this shape?
20 square units
100
What is the perimeter of this shape? 
20 units
100
What is the measure of x? 
65 degrees
100
What do we call two angles that are across from each other when two straight lines cross? 
vertical angles
200
What is the area of a circle of radius 2? 
4pi = 12.56
200
What is the circumference of a circle with diameter of 2?
2pi = 6.28
200
What is the area of this shape? 
18 square units
200
What is the perimeter of this shape? (Note, you can figure out the measure of y)
20 units
200
What is the measure of x?
41.5
200
Two complementary angles add up to ____ degrees
90
300
What is the area of a circle with a diameter of 6? 
if the diameter=6, then the radius is 3.
9 pi = 28.26
300
What is the circumference of a circle
with radius 1?
if the radius is 1, then the diameter is 2. so
c=pid. c= pi2= 6.28
300
What is the area of this shape? 
20 square units
300
What is the perimeter of this semicircle? 
c=pid/2 = pi2/2 = pi =3.14
add the base--> 5.14
300
What is the measure of x?
30 degrees
300
Two supplementary angles add up to _____ degrees
180
400
What is the area of a circle with diameter 7? 
pi(7/2)^2 = pi(3.5)^2 = 38.465
400
What is the circumference of a circle with radius 3? 
6pi = 18.84
400
What is the area of this semicircle with a diameter of 2? 
note: the radius is 1
(1/2) pir^2
1.57 square units
400
What is the perimeter of a semicircle with radius 2? 
If the radius is 2, then the diameter is 4
4+ (1/2)pid= 10.28
400
What is the measure of x? 
31.5
400
What do you call the line from the center of the circle to the outside of the circle?
radius
500
A circle has an area of
25pi
What is the radius of the circle?
pir^2 =25pi
r^2 = 25
r=5
500
A circle has a circumference of 31.4 feet. How long is the diameter?
c=pid
10 feet
500
What is the area of this ice cream cone? 
triangle= (1/2) 2x2= 2.
semicircle= (1/2) pir^2= 1.57
total = 3.57
500
What is the perimeter of this shape? 
triangle part = 5+4 = 9
semicircle= (1/2) pid= (1/2)pi(3) = 4.71
total = 9+4.71= 13.71
500
What is the measure of x?
110 degrees
500
What do you call the line that goes across the circle through the center?
diameter