Answer:
The correct answer option is b. m∠B = 61°.
Step-by-step explanation:
We are given a right angles triangle with an angle ABC equal to 29 degrees and side length BC known to be equal to 15.
We are supposed to find the measure of angle A.
We know that the sum of all three angles of a triangle must be 190 degrees. Since it is a right angled triangle, so ∠C = 90° and ∠B = 29°.
A° + B° + C° = 180°
A° + 29° + 90° = 180°
A° = 180° - 119°
A° = 61°
