Since it's a right triangle, one of the other angles is \(\displaystyle{90}^{\circ}\). The sum of all angles in a triangle is always 180. Let the third angle be x:

20+90+x=180

x=180-90-20

\(\displaystyle{x}={70}^{\circ}\)

Answer:

\(\displaystyle{90}^{\circ}{\quad\text{and}\quad}{70}^{\circ}\)

20+90+x=180

x=180-90-20

\(\displaystyle{x}={70}^{\circ}\)

Answer:

\(\displaystyle{90}^{\circ}{\quad\text{and}\quad}{70}^{\circ}\)