Geometry

Lines, angles, triangles, circles, proofs, and trigonometry. Covers TEKS §111.41.

Semester A

57 questions · 180 min · 80% to pass

Free Practice (10)
Semester B

40 questions · 180 min · 80% to pass

Free Practice (10)
Free practice gives instant feedback. Sign up for full mock exams.

Learn the Concepts

Visual lessons that build Geometry from first principles — diagrams, worked examples, embedded practice.

Concept Lesson · 8 min · TEKS 5A,5B,5C,5D
Parallel Lines & Transversals: The Eight Angles, Three Rules

When a transversal cuts two parallel lines, eight angles appear — but they're really just two values repeating. The three rules that turn every angle problem into a one-step calculation.

Start lesson →
Concept Lesson · 9 min · TEKS 7A,7B,9A
The Pythagorean Theorem: One Equation, Half the Geometry CBE

The most-tested theorem in Texas Geometry, derived visually. Find missing sides, recognize the five triples by sight, and avoid the two classic traps that cost students easy points.

Start lesson →
Concept Lesson · 7 min · TEKS 7B,9B
Special Right Triangles: 30-60-90 and 45-45-90 Without a Calculator

The two right-triangle shapes the Texas CBE loves to test. Memorize one ratio for each and skip the Pythagorean arithmetic on roughly 1 in 6 Geometry questions.

Start lesson →
Concept Lesson · 8 min · TEKS 9A,9B
SOH-CAH-TOA: Sin, Cos, Tan from First Principles

Three ratios, one angle, every right-triangle problem. The visual lesson that turns sin/cos/tan from a memorization headache into a 5-second decision.

Start lesson →
Concept Lesson · 10 min · TEKS 6A,6B,6D,7A,7B
Triangle Congruence & Similarity: SSS, SAS, ASA, AA and the Famous Traps

When are two triangles identical, when are they just scaled copies, and why do AAA and SSA never prove congruence? The five valid rules, the AA shortcut for similarity, and the k² / k³ area-and-volume scaling rule.

Start lesson →
Concept Lesson · 8 min · TEKS 6A,6B,6E,10A,10B
Quadrilaterals & Parallelograms: The Family Tree of Four-Sided Shapes

Square, rectangle, rhombus, parallelogram, trapezoid, kite — they're all related, and the relationship is the test. Learn the hierarchy and you'll never miss a 'must be / could be' question.

Start lesson →

What Students Are Saying

"
Took the Geometry CBE today. Several questions from the Texas CBE™ practice were nearly identical to what I saw on the actual exam.
Geometry student · May 2026

What's on the Geometry CBE

Every TEKS standard the official exam covers — and the exact topics our practice questions target.

SEMESTER A TEKS 1A–9B
  • 1A-1G Plan and Solve Real-world Problems
  • 2A-2C Coordinate Geometry
  • 4A-4D Logical Argumentation
  • 5A-5D Geometric Patterns, Conjectures, and Constructions
  • 6A-6E Proofs and Congruencies
  • 7A-7B Dilations and Similar Triangles
  • 8A-8B Proofs and Applications of Similarity Theorems
  • 9A-9B Trig Ratios and Special Right Triangles
SEMESTER B TEKS 1A–13E
  • 1A-1G Plan and Solve Real-world Problems
  • 3A-3D Transformations and Symmetries
  • 10A-10B Cross Sections and Dimensional Analysis
  • 11A-11D Area and Volume Problems
  • 12A-12E Circles
  • 13A-13E Probability

Geometry CBE — Common Questions

How much time do I need to study before the Geometry CBE?

It depends entirely on your starting point. A typical student benefits from 2–4 weeks of consistent practice (15–30 minutes a day) covering coordinate proofs, similarity, right-triangle trig, and circles. One Texas CBE™ user — an 8th grader accelerating into Geometry — recently passed after only 2 days of focused review on the platform. We don't promise that pace; we point it out so you know the prep can be efficient when it's targeted at the TEKS the exam actually tests.

How hard is the Geometry CBE?

The Geometry CBE expects fluency with proofs, coordinate geometry, transformations, similarity, right triangle trigonometry, and probability. Visual reasoning and the Pythagorean theorem appear repeatedly. Students who consistently hit 80%+ on our mock exams typically pass their first attempt.

What topics are on the Geometry CBE?

The exam covers all five TEKS reporting categories: Coordinate and Transformational Geometry; Logical Argument and Constructions; Proof and Congruence; Similarity, Proof, and Trigonometry; and Two-Dimensional and Three-Dimensional Figures plus Probability. Each is sampled across Semester A and B mock exams.

How long is the Geometry CBE?

The official Geometry CBE runs about 3 hours with roughly 50–57 questions, including diagrams and coordinate-plane problems. Our mock exams replicate this length and visual question style so your timing practice is realistic.

Do I need a calculator and a ruler for Geometry CBE?

Yes — a graphing calculator is permitted, and you may need basic geometric tools depending on the testing center's policy. Our practice questions provide the same diagrams and coordinates so you can train using on-screen reasoning.

Is the Geometry CBE harder than Algebra 1?

Most students find Geometry trickier because it requires both algebraic skill AND spatial/proof reasoning. The questions involve more diagrams. Our weak-point retargeting catches whether you struggle with proof logic, coordinate work, or trigonometric ratios — so prep time is spent where it matters.

What is the passing score for Geometry CBE?

70% — the same as all UT High School CBE exams. Aim for 80%+ on full-length mocks to give yourself a buffer against the harder proof-style questions on the official exam.