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21 May 2020, 01:35
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
20% (00:06) correct
80%
(01:04)
wrong
based on 5
sessions
History
Date
Time
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Not Attempted Yet
Two tangents xy and xz are drawn from a point x to a circle with centre w. If the length of xz is 156 and the length yz is 120, what is the radius of the circle?
A) 65
B) 60
C) 70
D) 75
Posted from my mobile device
A) 65
B) 60
C) 70
D) 75
Posted from my mobile device
shameekv1989
21 May 2020, 04:24
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carpedeim
Answer would be 65. It is based on 2 properties.
i) Tangents are perpendicular with the radius of the circle.
ii) 2 Tangents are equal in length originating from the same point outside the circle to that circle.
Using pythagorous theorem we can form separate equations to know the length of wx (center to outside point x). yz will be cut into half by this line wx.
Answer - A
22 May 2020, 11:01
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