Circumference of a Circle
What is the equation (s) for the circumference of a circle?
C=2πr or C=πd
What is the equation for the area of a circle?
A=πr^2
What is the equation for the area of a semicircle?
Area = pi*r^2/2
Describe the process needed to calculate the area of a composite figure. (Explain the 4 individual steps)
1. Identify and divide the composite figure into recognizable basic shapes (rectangles, triangles, circles, etc.).
2. Use the appropriate formula or equation for each simple shape
3. If the composite figure is made of multiple shapes, add their areas together. If a part of the shape is missing (such as a hole or cut-out), subtract the area of that part.
4. Ensure your final answer has the correct square units (e.g., cm², in², m²).
Who is your favorite Teacher?
Ms. Calvert
Find the Circumference of a Circle. Use 3.14 for pi and Round to the tenth place
See Slide 2D Geometry Quiz Review - Circumference of a Circle 200
52.1 yd
Find the area of the circle. Use 3.14 for pi
See Slide 2D Geometry Quiz Review - Area of Circles 200
452.16 cm2
What is the equation for the perimeter of a semicircle?
P = pi*d/2 + diameter or P = 2*pi*r/2 + diameter
Find the area of the composite shape.
See Slide 2D Geometry Quiz Review - Area of a Composite Shape 200
189.25 in2
Who is your favorite Nurse?
Ms. Kristy
Find the Circumference of a Circle. Use 3.14 for pi and Round to the tenth place
See Slide 2D Geometry Quiz Review - Circumference of a Circle 300
26.4 yd
Find the area of the circle. Use 3.14 for pi
See Slide 2D Geometry Quiz Review - Area of Circles 300
approximately 113km^2
Find the area of the semicircle. Use 3.14 for pi
See Slide 2D Geometry Quiz Review - Area and Perimeter of a Semicircle 300
25.12 in^2
Find the area of the composite shape.
See Slide 2D Geometry Quiz Review - Area of a Composite Shape 300
21.5cm2
what two things on a graph have to occur for it to be proportional?
Straight Line and Go through the orgin
Find the Circumference of a Circle where the radius = 9.5 in Round to the tenth.
59.7 in
Find the area of a circle with the radius 13.2 km Round to the tenth.
approximately 547.1km^2
Find the perimeter of the semicircle. Use 3.14 for pi
See Slide 2D Geometry Quiz Review - Area and Perimeter of a Semicircle 400
20.56 in
Find the area and perimeter of the composite shape.
See Slide 2D Geometry Quiz Review - Area of a Composite Shape 400
Area = 53.12 ft²
Perimeter = 30.56 ft
A certain brand of shampoo contains 12 ounces in a bottle. The company decides to redesign the shape of the shampoo bottle. The new type of bottle contains 15 ounces of shampoo. What is the percent of increase in the amount of shampoo the new bottle contains? Use any strategy.
25%
Find the radius of the circle given the circumference of 62.8 mi
10 mi
Find the diameter of the circle given the area of 78.5 ft²
10 ft
If the area of a semicircle = 14.13 in^2 what is the diameter?
6
Find the area and perimeter of the composite shape.
See Slide 2D Geometry Quiz Review - Area of a Composite Shape 500
Area = 78 cm²
Perimeter = 44 cm
If I multiply 2 negative numbers my answer will be what?
Positive