Radius and Diameter
Find the radius of image #1.
10 feet
The formula for Area of a Circle
A = 𝝅r2
Find the Perimeter of the Composite Figure in image #6.
16 units
no straight sides, has a radius and a center
circle
Find the Circumference of image #15.
37.68 in
Find the diameter of image #2.
14 meters
Formula for Circumference of a Circle when you have the diameter
C = 𝝅d
Find the Perimeter of the figure in image #7.
32 units
4 sided figure that has one set of parallel sides
Trapezoid
Find the Circumference of image #16 rounded to the nearest tenth.
87.9 in
Find the radius of image #3.
7 feet
Formula for Circumference of a Circle when you have the radius
C = 2𝝅r
Find the Perimeter of the figure in image #8.
29.7 feet
4 sided figure that has 4 right angles
rectangle
Find the perimeter of the semicircular in image #17.
71.96 yd
Find the diameter of image #4.
4 centimeters
Formula for Area of a Rectangle (and Square)
A = l x w
Find the Perimeter of the figure in image #9.
56 meters
This type of triangle has 2 congruent sides
Isosceles
Find the perimeter of the semicircular in image #18.
38.55 ft
Find the radius of the small circle in image #5.
11 meters
How to find the perimeter of a Composite Figure (not a "formula")
Add all of the sides together
Find the Perimeter of the figure in image #10.
30.26 yards
This 4 sided shape had adjacent sides congruent
Kite
Image #19 - A coaster has a circumference of 12.56 inches. Suppose the same amount of coaster is visible around the bottom of a glass as shown. What is the circumference of the glass?
9.42 in