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Answer:

50 degrees

Step-by-step explanation:

You know it's a right angle, so that means it is 90 degrees, just subtract 40 degrees from 90 since you know a = 40 and a+b=90

Answer:

90 (degrees) - a = b

90 (degrees) - (40) = 50 (degrees)

Step-by-step explanation:

The little box in the corner indicates that it is a right angle, all right angles are equal to 90 degrees.

They gave you the value of (a) and we know that (b) must be equal to 90 degrees when added to (a).

Subtract 90 from 40 and that gives you fifty degrees.

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