Scale Drawings
Solve: 2/5 = x/35
x = 7
The diameter of a circle is 10 cm, the radius is...
The radius is 5 cm.
The distance all the way across a circle.
diameter
What does "circumference" mean?
Distance around a circle/ perimeter of a circle
The amount of space inside a circle.
Area of circle
Solve: 28/9 = 19.6/m
m = 6.3
The diameter is 12.5 ft, the radius is...
The radius is 6.25 ft
The radius of a circle is 10 cm, the diameter is...
d = 20 cm
Find the circumference if the diameter for this circle is 10 cm
C = 314 cm
The area of a circle with a diameter of 10 in^2 is...
A = 78.50 in^2
There is a rectangular picture frame that has a width of 2 ft and length of 3 ft. A similar rectangular picture frame has a length of 4.2 ft. What is the width?
2.8 ft
The circumference is 12.56 m, find the radius...
The radius is 2m. C = 12.56, 12.56 = 2πr, r = 2 m
The radius of a circle is 19 ft, the diameter is...
d = 9.5 ft
Find the circumference if the radius for this circle is 6.5 cm
C = 40.82 cm
The area of a circle with a diameter of 100 yd is...
A = 1000 yd^2
A palm tree casts a shadow that is 44 feet long. A 6 ft ladder casts a shadow of 16 feet long. What is the height of the palm tree?
16.5 ft
The circumference is 16π in, find the radius...
r = 8 in. C = 16π --> 16π = πd; d = 16, r = 16/2 = 8 in.
The circumference of a circular swimming pool is 314.1 ft, find the diameter...
d = 100 ft
Lisa wants to buy a round photo frame for her sister. The radius of the photo frame is 8 cm. What is the photo frame’s circumference?
A cruise ship has a large, circular window. It has a diameter of 12.5 meters. What is the window’s area?
A = 122.65 m^2
An architect is building a model of a tennis court for a new client. On the model, the court is 6 in wide and 13 in long. An official tennis court is 36 ft wide. What is the length of a tennis court?
78 ft long
The area of circle is 12.56 cm^2, the radius is ...
r = 2 cm, A = πr^2 --> 12.56 = πr^2 --> 4 = r^2 --> 2 = r
The area of a cake is 78.50 cm^2, find the diameter.
d = 10 cm, A = πr^2 --> 78.50 = πr^2 --> 25 = r^2 --> r = 5 cm, then d = 5 x 2 = 10 cm.
The area of a circular cup is 12.56 inch^2. Find the circumference of the circular cup.
12.56 = pi*r^2 --> 4 = r^ 2 --> 2 = r; C = 2*pi*r
C = 2*pi*2 = 12.56 in.
Justin wants to make a cookie for 3 friends. The radius of a cookie is 3 inches. If he wants to ice ALL 3 of the cookies, how many square inches of cookies must he cover with icing? *
A = 28.26 in^2 per cookies, 3 x 28.26 = 84.78 in^2 for 3 cookies