Can 90∘, 90∘ and 20∘ form a triangle?
Yes
Sometimes
No
Can't say
90∘ + 90∘ + 20∘ is not equal to 180∘
Hence they can not form a triangle
A triangle ABC can be formed when, ∠ ABC = 60°, ∠ BCA= 60° and ∠ CAB=90°