Question:
Find the missing number in the triangle:
Find the missing number in the triangle:
Show Hint
Whenever perfect squares appear, check square root pattern first.
Updated On: Apr 16, 2026
- 40
- 30
- 20
- 10
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The Correct Option is B
Solution and Explanation
Concept:
Inside number = sum of square roots of the corner numbers.
Step 1: First triangle.
\[ \sqrt{64}=8,\ \sqrt{36}=6,\ \sqrt{49}=7 \] \[ 8+6+7 = 21 \]
Step 2: Second triangle.
\[ \sqrt{121}=11,\ \sqrt{81}=9,\ \sqrt{100}=10 \] \[ 11+9+10 = 30 \] Conclusion: \[ {30} \]
Step 1: First triangle.
\[ \sqrt{64}=8,\ \sqrt{36}=6,\ \sqrt{49}=7 \] \[ 8+6+7 = 21 \]
Step 2: Second triangle.
\[ \sqrt{121}=11,\ \sqrt{81}=9,\ \sqrt{100}=10 \] \[ 11+9+10 = 30 \] Conclusion: \[ {30} \]
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