Answer:
Right angled and a scalene triangle
Explanation:
A right angled triangle is a triangle that has one of its angles to be 90°.
A scalene triangle is a triangle that has all his angles and sides to be different.
Based on the angles of the triangle given i.e 21°, 69° and 90°, the triangle can be classified as a RIGHT ANGLED TRIANGLE because it contains 90° as one of its angles.
The triangle is also classified as a SCALENE triangle because all the angles of the triangle are different i.e no two or three of the angles are the same.