Download Module 4 Letter - Newark City Schools

Math Connections for Parents
Grade 4 Module 4
Angle Measure and Plane Figures
Welcome to Module 4 of the EngageNY curriculum.
In this module,
students will explore angles and lines and the relationship between these
concepts. They will practice angle measurement and will group twodimensional objects based on shared attributes. Students will also
explore lines of symmetry in this module.
Important Words and Concepts
Note: Module 4 has many vocabulary words. Please see the
following pages for pictures further describing these terms.
 Angle: joining two rays sharing a common vertex
 Acute Angle: measures less than 90 degrees
 Obtuse Angle: measures greater than 90 but less than 180
degrees
 Right Angle: measures exactly 90 degrees
 Adjacent Angles: two angles with a common side
 Complementary angles: two angles with sum 90 degrees
 Supplementary angles: two angles with sum 180 degrees
 Vertical Angles: when two lines intersect, any two nonadjacent angles formed
 Straight Angles: angle measures 180 degrees
 Ray: begins at point, continues in one direction
 Line: continues in both directions
 Line Segment: line with two points, in between points is
the segment
 Parallel Lines: two lines in a plane that do not intersect
 Perpendicular Lines: two lines that intersect and form a 90
degree angle
 Intersecting Lines: lines that share at least one point in
common
 Vertex: point where two lines meet
 Acute Triangle: all interior angles measure less than 90
degrees
 Equilateral Triangle: Triangle with 3 equal sides
 Isosceles Triangle: Triangle with at least 2 sides equal
 Scalene Triangle: Triangles with no sides or angles equal
 Line of Symmetry: line through figure, when figure is
folded along the line, the two halves match exactly
KEY STANDARDS
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Recognize that an
angle is formed
when two rays
share a common
endpoint.
Measure angles in
whole-number
degrees using a
protractor.
Sketch angles of a
given
measurement.
Solve addition and
subtraction
problems to find
unknown angles
in real-world
problems
Draw points, lines,
line segments,
rays, angles,
perpendicular and
parallel lines.
Group twodimensional
figures based on
their attributes.
Recognize a line
of symmetry for a
two-dimensional
figure.
For more resources, please visit www.newarkcityschools.org → Parent Math Academy K-5
Math Connections for Parents
Grade 4 Module 4
Angle Measure and Plane Figures
Multiplication and Division within 100
Students in fourth grade are expected to know, from memory, all products of two one-digit
numbers. Continue to practice these facts at home.
Graphics and Strategies you may see…
Types of Angles
A Protractor is a tool we use to measure angles.
Note that one side of the angle should be lined up at
the 0 line for proper measurement. Ask yourself, “Is
the angle acute or obtuse?” to choose the correct
number on the protractor.
For more resources, please visit www.newarkcityschools.org → Parent Math Academy K-5
Math Connections for Parents
Grade 4 Module 4
Angle Measure and Plane Figures
Types of Triangles
When two lines or segments intersect, they form vertical and adjacent angles.
Angles A and C are vertical (opposite each
other, do not share a side). Angles B and
D are vertical.
Angles A and B are adjacent (share a
common side). Angles B and C are
adjacent. Angles C and D are adjacent.
Angles A and D are adjacent.
For more resources, please visit www.newarkcityschools.org → Parent Math Academy K-5