Question

∆ABC is a right - angled triangle in which ∆B = 90* If ∆ABD is an exterior angle of ∆ABC, find its measure.​

Answer 1

Answer:

90°

Step-by-step explanation:

Theoretically, if ∆B=90° then, the sum of other two angles, ∆A and ∆C will have to be 90° By Angle Sum prop. of triangle.

Visually, the image, in other words you can also use linear pair.

Answer 2

Answer:

90

because

according to the question

now we solve it

so

we get

abc is 90

because ,

sum of two angle greater than third

right angle property

so we get 90

Step-by-step explanation:

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