Polygons and Algebraic Relationships

Lesson 10

Math

Unit 5

10th Grade

Lesson 10 of 15

Objective


Calculate and justify the area and perimeter of parallelograms and triangles on the coordinate plane.

Common Core Standards


Core Standards

  • G.GPE.B.7 — Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula. Modeling is best interpreted not as a collection of isolated topics but in relation to other standards. Making mathematical models is a Standard for Mathematical Practice, and specific modeling standards appear throughout the high school standards indicated by a star symbol (★). The star symbol sometimes appears on the heading for a group of standards; in that case, it should be understood to apply to all standards in that group.

Foundational Standards

  • 7.G.B.6

Criteria for Success


  1. Find the area of a figure on the coordinate plane by either:
    1. Identifying the area of a rectangle that “inscribes” the shape and subtracting the shape outside the figure (decomposition).
    2. Identifying the lengths required by the formula to calculate.
  2. Find the perimeter of a figure on the coordinate plane by determining all the side lengths and finding the sum.

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Anchor Problems

25-30 minutes


Problem 1

Find the area and perimeter of the following figure:

Guiding Questions

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Problem 2

Find the perimeter and area of the following figure:

Guiding Questions

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Problem 3

Given $${A(2,3)}$$,

  1. What two other vertices create a triangle that can have an area of 8 square units?
  2. What is the perimeter of the triangle you drew?

Guiding Questions

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Target Task

5-10 minutes


On graph paper, draw a line segment with endpoints $${ A(0,2)}$$ and $${B(0,6)}$$.

  1. Plot point $${C(x,y)}$$  such that $${\triangle ABC}$$ has an area of $$6$$ square units.
  2. Is there more than one point for $$C$$ that satisfies these conditions? Explain your reasoning.
  3. If point $$C$$ were placed at $${ (2.75,0.8)}$$, would $${\triangle ABC}$$ have an area of $$6$$ square units? Show your reasoning.

References

Illustrative Mathematics Equal Area Triangles on the Same Base I

Equal Area Triangles on the Same Base I, accessed on May 31, 2018, 2:39 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.

Modified by Fishtank Learning, Inc.

Additional Practice


The following resources include problems and activities aligned to the objective of the lesson that can be used for additional practice or to create your own problem set.

Next

Calculate and justify composite and irregular areas on the coordinate plane.

Lesson 11
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Distance on the Coordinate Plane

Topic B: Classify Polygons using Slope Criteria and Proportional Line Segments

Topic C: Area and Perimeter On and Off the Coordinate Plane

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