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Question 164Asked in DSSSB TGT Computer Science, 25 Jun 2023, Shift 1 (8:30 AM)

AB is a tangent to a circle at B. O is the centre of the circle. If the circle radius is 40 mm and AB = 150 mm, calculate the length of AO.

  1. A57.30 mm
  2. B962 mm
  3. C155.2 mm
  4. D235.6 mm
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Correct answer: (C) 155.2 mm

Explanation

A tangent is perpendicular to the radius at the point of contact, so AO = √(40² + 150²) = √24100 ≈ 155.2 mm.

From DSSSB TGT Computer Science PYQ, 25 Jun 2023, Shift 1 (8:30 AM)

This is question 164 of DSSSB TGT Computer Science PYQ, 25 Jun 2023, Shift 1 (8:30 AM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.