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If the distance between point A (5, a) and B (17, 12) is 13 units, then find the value of a: 1. 7 units.2. 9 units3. 10 units4. 14 units |
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Answer» Correct Answer - Option 1 : 7 units. Given: Point A = (5, a) and Point B = (17, 12) The distance between the two points is 13 units. Formula Used: Distance between two points = √[(x2 – x1)2 + (y2 – y1)2] Calculation: Point A = (5, a) ⇒ x1 = 5 and y1 = a Point B = (17, 12) ⇒ x2 = 17 and y2 = 12 Using the formula, ⇒ 13 = √(x2 – x1)2 + (y2 – y1)2 ⇒ 13 = √(17 – 5)2 + (12 – a)2 ⇒ 132 = (12)2 + (12 – a)2 ⇒ 169 = 144 + (12 – a)2 ⇒ (12 – a)2 = 169 – 144 ⇒ (12 – a)2 = 25 ⇒ 12 – a = √25 ⇒ 12 – a = 5 ⇒ a = 12 – 5 ⇒ a = 7 ∴ The value of a is 7 units. |
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