Question

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Answer 1

Answer:

Explanation:

In ABC if B=90 then A+B=90

Answer 2

Answer :-

Given :-

▪️One angle of a triangle is equal to the sum of the other two.

◾Property used to prove :-

▪️Sum of all angles in a triangle = 180°

Proof :-

Let the angle be = "x"

And other angles be = "a" & "b"

◾So according to situation provided :-

a + b = x ....(i)

◾Also from Angle sum property of Triangle .

a + b + x = 180° ......(ii)

◾Now by substiting value of (i) in (ii)

→ x + x = 180°

→ 2x = 180°

→ x = 90°

Now from the definition of right angle Triangle :-

A triangle with one angle = 90° is a right angle triangle.

Hence Proved