Free Printable WorksheetMathTrigonometryMath CurriculumUTRI.PPC.3

TRIG.135 Convert a complex number to polar form and interpret modulus and argument Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Trigonometry Math worksheet provides structured practice on TRIG.135 Convert a complex number to polar form and interpret modulus and argument. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

TRIG.135 Convert a complex number to polar form and interpret modulus and argument - Primary standard selected for prompt fields in this prompt cell: UTRI.PPC.3. Skill statement in this prompt cell: Select the modulus and argument for a complex number and choose the correct polar-form expression r(cos theta + i sine theta). Associated standards listed with this skill in this prompt cell: UTRI.PPC.3; CCSS HSN.CN.B.4 (+); MA 2017 N-CN (+). Use this prompt-provided wording as the supporting standard description for this workflow.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Trigonometry

Subject

Math

Domain

Math Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related TRIG.135 Convert a complex number to polar form and interpret modulus and argument skill assessments:

Problem 1Difficulty: Mastery
Which choice correctly converts the complex number -18sqrt(3) + 18i to r(cos(theta) + i sin(theta)) form? Use 0 <= theta < 2pi.
Ar = 41; theta = 5pi/6; polar form = 41(cos(5pi/6) + i sin(5pi/6))
Br = 36; theta = pi/6; polar form = 36(cos(pi/6) + i sin(pi/6))
Cr = 35; theta = 7pi/6; polar form = 35(cos(7pi/6) + i sin(7pi/6))
Dr = 36; theta = 5pi/6; polar form = 36(cos(5pi/6) + i sin(5pi/6))
Solution & Explanation:Compute abs(z) = sqrt((-18sqrt(3))2 + 182) = 36. The signs place z in Quadrant II; using reference angle pi/6 gives theta = 5pi/6. Therefore z = 36(cos(5pi/6) + i sin(5pi/6)).
Problem 2Difficulty: Mastery
Treat z = -sqrt(7) + sqrt(7)i as the point (a, b) = (-sqrt(7), sqrt(7)) in the complex plane. Which option identifies |z|, theta, and polar form?
Ar = 14; theta = 3pi/4; polar form = 14(cos(3pi/4) + i sin(3pi/4))
Br = sqrt(14); theta = pi/4; polar form = sqrt(14)(cos(pi/4) + i sin(pi/4))
Cr = sqrt(14); theta = 3pi/4; polar form = sqrt(14)(cos(3pi/4) + i sin(3pi/4))
Dr = sqrt(13); theta = 5pi/4; polar form = sqrt(13)(cos(5pi/4) + i sin(5pi/4))
Solution & Explanation:Compute abs(z) = sqrt((-sqrt(7))2 + (sqrt(7))2) = sqrt(14). The signs place z in Quadrant II; using reference angle pi/4 gives theta = 3pi/4. Therefore z = sqrt(14)(cos(3pi/4) + i sin(3pi/4)).
Problem 3Difficulty: Mastery
An expression for a complex number is -15(cos(4pi/3) + i sin(4pi/3)). Normalize it to standard polar form; choose the correct line.
Ar = 225; theta = pi/3; polar form = 225(cos(pi/3) + i sin(pi/3))
Br = 15; theta = pi/3; polar form = 15(cos(pi/3) + i sin(pi/3))
Cr = 15; theta = 4pi/3; polar form = 15(cos(4pi/3) + i sin(4pi/3))
Dr = 14; theta = 2pi/3; polar form = 14(cos(2pi/3) + i sin(2pi/3))
Solution & Explanation:Making the modulus positive adds pi: 4pi/3 + pi = 7pi/3, and 7pi/3 - 2pi = pi/3. So the standard form is 15(cos(pi/3) + i sin(pi/3)).

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Trigonometry Math students. It aligns with educational standard UTRI.PPC.3 (Primary standard selected for prompt fields in this prompt cell: UTRI.PPC.3. Skill statement in this prompt cell: Select the modulus and argument for a complex number and choose the correct polar-form expression r(cos theta + i sine theta). Associated standards listed with this skill in this prompt cell: UTRI.PPC.3; CCSS HSN.CN.B.4 (+); MA 2017 N-CN (+). Use this prompt-provided wording as the supporting standard description for this workflow.).

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