Respuesta :

Answer:

the measure of angle is m(<a)=40

Step-by-step explanation:

the intirior angles of all triangles add up to 180

with this you can subtract the 90 degree angle and the 50 degree angle from the total of 180 degrees.

180

90

-50

---------

=40 degreese

hoped this helped.

aarshananeupane1

Step-by-step explanation:

a+50+90=180°(being sum of angle of right angled▲)

or, a+140= 180°

or, a=180°_ 140°

Therefore, a=40°