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. Pembetatu yenye pande 3:4:5 mita (au yenye pande ambazo ni vizidishio vya takwimu hizi) ina pembe ya digrii 90.