# Math (TAG): Geometry Concepts and Angle Measurement

### Suggested Time Frame: 13 Instructional Days

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##### Focus TEKS

Attributes of 2-D Figures

• 4.6D classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines or the presence or absence of angles of a specified size. – R RC3
• 4.6A identify points, lines, line segments, rays, angles, and perpendicular and parallel lines; – S RC3
• 4.6B identify and draw one or more lines of symmetry, if they exist, for a two-dimensional figure; – S RC3
• 4.6C apply knowledge of right angles to identify acute, right, and obtuse triangles; and – S RC3

Measuring Angles

• 4.7C determine the approximate measures of angles in degrees to the nearest whole number using a protractor; – R RC3
• 4.7A illustrate the measure of an angle as the part of a circle whose center is at the vertex of the angle that is “cut out” by the rays of the angle. Angle measures are limited to whole numbers; – NT
• 4.7B illustrate degrees as the units used to measure an angle, where 1/360 of any circle is one degree and an angle that “cuts” n/360 out of any circle whose center is at the angle’s vertex has a measure of n degrees. Angle measures are limited to whole numbers; – NT
• 4.7D draw an angle with a given measure; – S RC3
• 4.7E determine the measure of an unknown angle formed by two non-overlapping adjacent angles given one or both angle measures. – S RC3 [including complementary and supplementary angles]
##### Numeracy TEKS

3rd Grade – Developing Strategies for Multiplying and Dividing within 100

• 3.4F recall factsÂ to multiply up to 10 by 10 with automaticity and recall the corresponding division facts;- S RC2
• 3.4DÂ determine the total number of objects when equally-sized groups of objects are combined or arranged in arrays up to 10 by 10; â€“ S RC2
• 3.4EÂ represent multiplication facts by using a variety of approaches such as repeated addition, equal-sized groups, arrays, area models, equal jumps on a number line, and skip counting; â€“ S RC2
• 3.4HÂ determine the number of objects in each group when a set of objects is partitioned into equal shares or a set of objects is shared equally; â€“ S RC2
• 3.4GÂ use strategies and algorithms, including the standard algorithm, to multiply a two-digit number by a one-digit number. Strategies may include mental math, partial products, and the commutative, associative, and distributive properties; â€“ S RC2
##### Spiral Review TEKS

Represent and Analyze Stem-and-Leaf Plots

• 4.9A represent data on a frequency table, dot plot, or stem-and-leaf plot marked with whole numbers and fractions; – R RC4
• 4.9B solve one- and two-step problems using data in whole number, decimal, and fraction form in a frequency table, dot plot, or stem-and-leaf plot. – S RC4

Grade 3 Representing and Solving Story Problems

• Computation and Problem Solving
• 3.4A solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction; â€“ R RC2
• 3.4BÂ round to the nearest 10 or 100 or use compatible numbers to estimate solutions to addition and subtraction problems; â€“ S RC2
• 3.4KÂ solve one-step and two-step problems involving multiplication and division within 100Â using strategies based on objects; pictorial models, including arrays, area models, and equal groups; properties of operations; or recall of facts. â€“ R RC2
• 3.8BÂ solve one- and two-step problems using categorical data represented with a frequency table, dot plot, pictograph, or bar graph with scaled intervals. â€“ S RC4
• Representing
• 3.5AÂ represent one- and two-step problems involving addition and subtraction of whole numbers to 1,000 using pictorial models, number lines, and equations; â€“ R RC2
• 3.5BÂ represent and solve one- and two-step multiplication and division problemsÂ within 100 using arrays, strip diagrams, and equations; â€“ R RC2
• 3.5EÂ represent real-world relationships using number pairs in a table and verbal descriptions.Â â€“ R RC2