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Solve this faster with the right shortcut first
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 5
Multiple Choice Question
Question
A rectangle has length 12 cm and breadth 9 cm. What is the length of its diagonal?
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Geometry
The diagonal is 15 cm.
Why this answer is correct
The answer uses the formula that matches the figure and target quantity.
Short Explanation
The diagonal is 15 cm.
Detailed Explanation
Question
A rectangle has length 12 cm and breadth 9 cm. What is the length of its diagonal?
ANSWER
Correct Answer: C
Method / Topic: Geometry
Using Pythagoras: diagonal = √(12²+9²)=√(144+81)=√225=15 cm.
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Question 5
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Learn + solve
Shortcut used, common trap, and the fastest solving route
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
A rectangle has length 12 cm and breadth 9 cm. What is the length of its diagonal?
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Geometry
The diagonal is 15 cm.
Why this answer is correct
The answer uses the formula that matches the figure and target quantity.
Short Explanation
The diagonal is 15 cm.
Detailed Explanation
Question
A rectangle has length 12 cm and breadth 9 cm. What is the length of its diagonal?
ANSWER
Correct Answer: C
Method / Topic: Geometry
Using Pythagoras: diagonal = √(12²+9²)=√(144+81)=√225=15 cm.
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