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SSC CGL Quantitative Aptitude Geometry Medium Practice Question

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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Identify the figure and whether area, perimeter, volume, or surface area is asked.

Solve in 3 steps:

Fix the shape.
Choose the matching formula.
Substitute values with units.

Common mistake: Do not use area formula when perimeter or volume is asked.

Question 10 Multiple Choice Question

Question

In a triangle, two angles are 39° and 66°. Find the third angle.

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Geometry

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required answer is 75.

Why this answer is correct

The answer uses the formula that matches the figure and target quantity.

Short Explanation

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required answer is 75.

Detailed Explanation

Question

In a triangle, two angles are 39° and 66°. Find the third angle.

ANSWER

Correct Answer: A

Method / Topic: Geometry

METHOD

Identify the relevant geometry theorem or property and apply it directly to the given numerical information.

STEP-BY-STEP CALCULATION

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required

COMMON MISTAKE

Do not confuse corresponding angles with supplementary angles, radius with diameter, or central angles with angles at the circumference.

PRACTICAL EXAMPLE:

Geometry

Final Answer

The calculated value is the required

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Question 10

Medium Marks: 1.0 Practice Question

Free access limit is ending soon

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View Plans

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Identify the figure and whether area, perimeter, volume, or surface area is asked.

Solve in 3 steps:

Fix the shape.
Choose the matching formula.
Substitute values with units.

Common mistake: Do not use area formula when perimeter or volume is asked.

Question

In a triangle, two angles are 39° and 66°. Find the third angle.

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Geometry

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required answer is 75.

Why this answer is correct

The answer uses the formula that matches the figure and target quantity.

Short Explanation

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required answer is 75.

Detailed Explanation

Question

In a triangle, two angles are 39° and 66°. Find the third angle.

ANSWER

Correct Answer: A

Method / Topic: Geometry

METHOD

Identify the relevant geometry theorem or property and apply it directly to the given numerical information.

STEP-BY-STEP CALCULATION

Use the triangle angle-sum property: the three interior angles total 180°. Therefore, the required

COMMON MISTAKE

Do not confuse corresponding angles with supplementary angles, radius with diameter, or central angles with angles at the circumference.

PRACTICAL EXAMPLE:

Geometry

Final Answer

The calculated value is the required

Locked premium value

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Use the free answer check first, then unlock the complete breakdown, shortcut path, and richer explanations for similar questions.

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Shortcut used, common trap, and the fastest solving route

In a triangle, two angles are 39° and 66°. Find the third angle.

Explanation

Short Explanation

Detailed Explanation

See full explanation + shortcut trick

Keep Practicing This Pattern

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Shortcut used, common trap, and the fastest solving route

In a triangle, two angles are 39° and 66°. Find the third angle.

Explanation

Short Explanation

Detailed Explanation

See full explanation + shortcut trick

Keep Practicing This Pattern

Recommended Next Practice

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