MAFS.912.G-C.2.5
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Congruence, Similarity, Right Triangles & Trig - 46%
MAFS.912.G-
CO.1.1 Definitions
CO.1.2 Use Transformations
CO.1.5 Map Transformations
CO.2.6 Rigid Motions
CO.3.9 Line & L Theorems
CO.3.10 Triangle Theorems
CO.3.11 Parallelograms
CO.4.12 Constructions
SRT.1.1 Dilations
SRT.1.2 Def of Similarity
SRT.1.3 AA Similarity
SRT.2.5 ~ & Criteria of
s
SRT.3.8 Trig & Pyth Theorem
Circles, Geometric Measurement & Geometric Properties with Equations - 38%
MAFS.912.G-
C.1.1 Similar Circles
C.1.2 Chord-L Relationships
C.1.3 Inscribe/Circumscribe
C.2.5 Arcs, Angles, Sectors
GMD.1.1 Argue Formulas
GMD.1.3 Use Formulas
GMD.2.4 Identify Objects
GPE.1.1 Equation of a Circle
GPE.2.4 Use Coordinates
GPE.2.5 Use || and Slope
GPE.2.6 Segment Ratios
GPE.2.7 Coordinate Per/Area
Modeling with Geometry - 16%
MAFS.912.G-
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What You Need To Know...
MAFS.912.G-C.2.5 - Arc lengths, radian measure, area of a sector, proportionality of components of a circle.
1. The benchmark will be assessed using Graphic Response, Hot Text Response, Movable Text Response, Multiple Choice Response, Multi-select Response, Open Response, Selectable Text Response and Simulation Response.
2. Items may require students derive or use the formula for the area of a sector.
3. Items may require students to apply similarity to solve problems that involve the length of the arc intercepted by an angle and the radius of a circle.
4. Items may require students to use similarity to derive the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure as the constant of proportionality.
Example One
Example Two
Allison created an embroidery design of a stylized star emblem. The perimeter of the design is made by alternating semicircle and quarter-circle arcs. Each arc is formed from a circle with a 2½-inch diameter. There are 4 semicircle and 4 quarter-circle arcs, as shown in the diagram below.
To the nearest whole inch, what is the perimeter of Allison's design?
- 15 inches
- 20 inches
- 24 inches
- 31 inches
Additional Examples
Reference Sheet
Select sample problems taken from FLDVIPN teacher materials
Violet Esopakis - Palm Beach Co.
Stephanie Fitzwater - Seminole Co.
Angela Kerins - Orange Co.
Lisa Lasseter - St. Johns Co.
Jodi Van Wagoner - Brevard Co.