Allied & ICAR Exam Bank • ALLIED_2212 NAT • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

Two circles of radii 9 cm and 4 cm touch each other externally. The length of their direct common tangent in cm is:

Answer Key:

12

Step-by-Step Solution & Explanation

Direct common tangent $= 2\sqrt{r_1 r_2} = 2\sqrt{9 \times 4} = 2 \times 6 = 12$ cm.
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