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Question

Find the value of x in the following diagram given that the horizontal lines are parallel to each other:
[4 MARKS]

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Solution

Properties: 2 Marks
Steps: 1 Marks
Result: 1 Mark

In the given triangle,
Two sides are equal and the angle made by joining them is 90o.
Let the other angles be y ( equal sides have equal angles opposite to them)
For the given triangle,
Sum of all angles = 180o
Or, y + y + 90o = 180o
Or, 2y = 180o - 90o
Or, y = 90o2 = 45o

The two horizontal lines are parallel to each other.
X = 45o + y ( interior alternate angles are equal)
Or, X = 45o + 45o = 90o

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