Pic.png [ 38.87 KiB | Viewed 1252 times ]
Detailed SolutionStep-I: Given Info
The question asks us to find the value of x as indicated in the figure, using the 2 statements given.Step-II: Interpreting the Question Statement
To find the value of x from the given figure, we have to make use of different concepts of geometry based on the information given in the individual statements.
We will also modify the figure as per our convenience to be able to solve the problems easily.
The modified figure is attached as Pic.png(Attached), with all angles marked.Step-III: Statement-I
Statement- I gives us the information that AD = AE = BE = CD = BC.
Now from the Pic.png(Attached) and using the information in statement 1, we know
Equation 1: x=t=z (Because AE=BE=AD) (Concept Used: Angles opposite to equal sides are equal)
Equation 2: v=t+s & w=z+y (Because BE=BC=CD) (Concept Used: Angles opposite to equal sides are equal)
Equation 3: w=x+t (Concept Used: Exterior angle of a traingle is equal to the Sum of Interior opposite angles)
Combining the results of the above 3 equations
By equation 2 and 3;
From Equation 1 x=z=t, so we have x+y=2*x
This means y=x
Also combining this result with equation 1&2, we get y=x=z=t=s
Now considering Triangle ABC,
We know that Sum of Angles in a triangle is 180 degree,
So, \(x+z+y+t+s = 180\)
Since all these 5 angles are equal to each other, we have 5*x=180 or x=36
Hence, statement 1 is sufficient to answer the question.Step-IV: Statement-II
Statement- II gives us information that x=y. We dis drive this result from statement 1, but it is not sufficient to answer the question since neither value of x or y is given nor any other condition of the triangle is given to come to a definite value of x.
Hence, statement 2 is not sufficient to answer this question.Step-V: Combining Statements I & II
Since, we have a unique answer from Statement- I so, we don’t need to combine Statements- I & II.
Hence, the correct answer is Option A
1. Use of Property: Exterior angle of a triangle is equal to the sum of the interior opposite angles.
2. Use of Property: Angles opposite to equal sides are equal.