Right
adjective
Straight, not bent.
“a right line”
Of an angle, having a size of 90 degrees, or one quarter of a complete rotation; the angle between two perpendicular lines.
“The kitchen counter formed a right angle with the back wall.”
Of a geometric figure, incorporating a right angle between edges, faces, axes, etc.
“a right triangle, a right prism, a right cone”
Synonyms: correct, just, conservative, right-wing, dexter, dextral, right-hand