Castle 9

Georgia's K-12 Mathematics Standards:

• 4.GSR.7.1 — Recognize angles as geometric shapes formed when two rays share a common endpoint. Draw right, acute, and obtuse angles based on the relationship of the angle measure to 90 degrees.
• 4.GSR.7.2 — Measure angles in reference to a circle with the center at the common endpoint of two rays. Determine an angle’s measure in relation to the 360 degrees in a circle through division or as a missing factor problem.
• 4.GSR.8.1 — Explore, investigate, and draw points, lines, line segments, rays, angles (right, acute, obtuse), perpendicular lines, parallel lines, and lines of symmetry. Identify these in two-dimensional figures.
• 4.GSR.8.2 — Classify, compare, and contrast polygons based on lines of symmetry, the presence or absence of parallel or perpendicular line segments, or the presence or absence of angles of a specified size and based on side lengths.
• 4.GSR.8.3 — Solve problems involving area and perimeter of composite rectangles involving whole numbers with known side lengths.

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