
In figure, . If then prove that

Answer
516.9k+ views
Hint:Here we prove the two right angled triangles congruent by Side angle side congruence and since we know corresponding angles of congruent triangles are equal which will give us our required proof.
* Two triangles are congruent if they follow any of the following associativity
SAS – Side, angle, side
SSS – Side, Side, Side
AAA – Angle, Angle, Angle
* Perpendicular at any point of the line makes a right angle at that point.
Complete step-by-step answer:
We are given that and since we know that if two line segments are perpendicular to each other at a point means they form angle at that point.
So,
Also, we have
We have
Now we know if we add the same quantity to both sides of the equation then the equality remains unchanged.
Therefore, adding the length on both sides of the equation
From the figure, the length the equation becomes
Now we prove the two triangles
We have , and
Therefore, we have two sides equal and one angle equal in both triangles. So, by SAS associativity
.
Now from the property of congruent triangles, the corresponding angles are equal if two triangles are congruent to each other.
So here the set of corresponding angles equal are
Thus,
Note:Students are likely to make mistake while making out which angle is equal to which angle when two triangles are congruent, so use the fact that we move from left to right while writing the angles when we are given which triangle is congruent to which triangle.
* Two triangles are congruent if they follow any of the following associativity
SAS – Side, angle, side
SSS – Side, Side, Side
AAA – Angle, Angle, Angle
* Perpendicular at any point of the line makes a right angle at that point.
Complete step-by-step answer:
We are given that
So,
Also, we have
We have
Now we know if we add the same quantity to both sides of the equation then the equality remains unchanged.
Therefore, adding the length
From the figure, the length
Now we prove the two triangles
We have
Therefore, we have two sides equal and one angle equal in both triangles. So, by SAS associativity
Now from the property of congruent triangles, the corresponding angles are equal if two triangles are congruent to each other.
So here the set of corresponding angles equal are
Thus,
Note:Students are likely to make mistake while making out which angle is equal to which angle when two triangles are congruent, so use the fact that we move from left to right while writing the angles when we are given which triangle is congruent to which triangle.
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