For the exact angle of 90 degrees is one step. Triangle with sides 3:4:5 meters (or with sides that are multiples of these figures) has an angle of 90 degrees.
Kwa angle halisi ya digrii 90 ni hatua moja. Triangle kwa pande 3:4:5 mita (au kwa pande kwamba ni mafungu ya takwimu hizi) ina angle ya nyuzi 90.