Question

please solve with full explanation​

Answer 1

Answer:

let the 1st angle be x

let the 2nd angle be y

let the 3rd angle be z

x+y+z=180(asp of triangle)

x+x=180(y+z=x)

2x=180

x=90

so 1st angle is 90

hence the triangle is right angle triangle

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Answer 2

Answer:

It is proved.

Step-by-step explanation:

In ΔABC:

∠A = 90°

∠B = 45°

∠C = 45°

∠A = ∠B + ∠C

90° = 45° + 45°

90° = 90°

So, it is proven that the sum of other two angles is equal to one angle, and also the angle is 90°, which is a right angle.

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