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150 multiple-choice questions, 40 flashcards and 10 scenario simulations, written to the Common Core State Standards blueprint. Every question carries a full rationale.
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Common Core State Standards (CCSS) — Mathematics, Grade 4: Geometry (4.G.A.1-3). Public standards from corestandards.org.
CoStudy's 4th Math: Geometry bank holds 200 items. Every multiple-choice question carries a written rationale explaining why the correct answer is correct and why each distractor is tempting but wrong, and the bank includes 10 scenario-based simulations.
A sample of 12 multiple-choice questions from the bank, with the full rationale shown.
Which triangle has all sides equal?
Answer: C — Equilateral
C) Correct. B) 2 equal. A) 0 equal. D) has right angle.
To check line symmetry, you can:
Answer: D — Fold the shape along the line
D) Correct — halves match. B) rotational. C) translation. A) wrong.
An octagon has ______ sides.
Answer: A — 8
A) Correct. B) hexa. C) quad. D) deca.
An oval/ellipse has ______ lines of symmetry.
Answer: A — 2 (major & minor axes)
A) Correct. B/C) wrong. D) circle only.
A right isosceles triangle has ______ lines of symmetry.
Answer: A — 1
A) Correct — through apex. B/C/D) wrong.
An equilateral triangle has ______ lines of symmetry.
Answer: A — 3
A) Correct — one per side. B/C/D) wrong.
A triangle with one obtuse angle is:
Answer: D — An obtuse triangle
D) Correct. B/C/A) wrong.
A stop sign has how many equal sides?
Answer: B — 8
B) Correct. B/C/D) wrong.
A quadrilateral can be classified by:
Answer: D — Sides AND angles
D) Correct. B/C) partial. A) wrong.
Which shape has 4 equal sides but not necessarily right angles?
Answer: B — Rhombus
B) Correct. A) rectangles have right angles but not always equal sides. C/D) wrong.
A letter O has how many lines of symmetry?
Answer: C — At least 2 (V + H)
C) Correct — vertical and horizontal (many treat O as circle → infinite). B/C/D) wrong.
Lines that share a point are called:
Answer: A — Intersecting
A) Correct. B) never meet. C/D) wrong.
5 sample cards from the 40 in the bank.
What is a 'line of symmetry'?
A line that divides a shape into two halves that are mirror images.
In a square, are opposite sides parallel?
Yes — both pairs are parallel.
What is an 'isosceles triangle'?
A triangle with 2 sides equal (and 2 angles equal).
What is a 'point'?
A specific location in space — has no size. Marked with a dot and a capital letter.
What is a 'straight angle'?
A 180° angle — a straight line.
These samples are a small slice. The full bank runs flashcards, multiple choice and timed mock exams with per-chapter progress tracking, on the web and in the iOS app.
The 4th Math: Geometry bank holds 200 items: 150 multiple-choice questions, 40 flashcards and 10 scenario-based simulations. 17 of them are on this page to read free, with no signup.
Yes. Every multiple-choice item carries a written rationale that states the controlling principle behind the correct answer and then addresses each wrong option in turn — why it tempts and precisely where it fails. Knowing why the plausible answer was wrong is worth more than knowing which letter was right.
Common Core State Standards (CCSS) — Mathematics, Grade 4: Geometry (4.G.A.1-3). Public standards from corestandards.org.
The samples on this page are free to read in full, rationales included, with no account. The complete 200-item bank, the timed mock exams and per-chapter progress tracking are part of CoStudy on the web and in the iOS app.
Last reviewed 2026-08-22. Banks are written against the certifying body's published exam outline and re-checked when that outline changes — exams get renumbered, retired and reweighted, and a bank written to a superseded outline teaches the wrong proportions. Figures that are re-indexed annually are deliberately not asserted as rules; the questions test the governing principle instead.