Can somebody please explain this :
- Attachments
-
- value x figure.doc
- (79 KiB) Downloaded 109 times
Wanna know what I'm upto? Follow me on twitter: https://twitter.com/harikrish
I'm using the '<' notation to denote an angle.
<TSU + <RSQ + x = 180
1) <RQS = <RSQ
Lets say <QRS = a.
So <RQS = <RSQ = (180 - a)/2
We don't know the value of a and <TSU, hence insufficient.
2) <TSU = <TUS
Lets say <STU = b.
So <TSU = <TUS = (180 - b)/2
We don't know the value of b and <RSQ, hence insufficient.
Combining both statements:
<TSU + <RSQ + x = 180
(180-a)/2 + (180-b)/2 + x = 180 (Eqn 1)
And we know that a + b = 90 (Eqn 2)
Inserting equation 2 into equation 1:
(180 - (90 - b))/2 + (180 - b)/2 + x = 180
(90 + b + 180 - b)/2 + x = 180
270/2 + x = 180
x = 45. Sufficient.
Choose C.
-BM-
