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Question

ABCD is a rectangle. If OB = x + 2 and AC = 5x - 2, then find the measure of AC.


A

6 units

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B

7 units

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C

8 units

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D

9 units

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Solution

The correct option is C

8 units



BD = BO + OD ...(i)
AC = AO + OC ...(ii)
Since, diagonals are equal and bisect each other.
BD = AC
So, AC = BO + OD ...(iii)

Also, OD = OB ...(iv)
(Substitute (iv) in (iii))

AC = OB + OB = 2OB
So, 5x - 2 = 2 (x + 2)
5x - 2 = 2x + 4
5x - 2x = 4 + 2
3x = 6
​ x = 2

AC = 5x - 2 = (5 × 2) - 2
= 10 - 2
= 8 units


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