Question

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Answer 1

Option (d) is correct....

Explanation :-

Let the angles be a, b and c

According to question,

a = b + c ------(1)

By angle sum property of triangle,

a + b + c = 180°

=> a + a = 180°. [ using equation 1 ]

=> 2a = 180°

=> a = 90°

So, the given triangle is right angled.

Answer 2

(Q.4) - Option (d).

Let the angles of a triangle be a, b, c.

We know that sum of the angles in a triangle = 180 degrees.

= > a + b + c = 180  --------  (1)

Given that one angle of a triangle is equal to the sum of other two equal angles.

= > a = b + c   ---------- (2) 

Substitute (2) in (1), we get

= > a + a = 180

= > 2a = 180

= > a = 90.


Hence, the triangle is a right-angled triangle.


Hope this helps!