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An angle of 90°, as in a corner of a square, or formed by dividing a circle into quarters.
‘One day at school we were told that if AB is a diameter of a circle, and C is any point on the circumference, then the angle ACB is a right angle.’
‘If you draw tangents at P and Q they are at right angles.’
‘Only later when I walked the whole of the Thames I found it wiggled and curved with no right angles.’
‘Zeno also attacked Euclid's proof of the equality of right angles on the grounds that it presupposes the existence of a right angle.’
‘The nurse extends the patient's arms on padded arm boards and positions the patient's elbows at right angles.’
‘Huge cracks blemished the skis, the bindings were grotesquely twisted, and the poles bent at right angles.’
‘He also designed an instrument to divide a right angle into a given number of equal parts.’
‘Walls unexpectedly meet at acute and obtuse angles rather than commonplace right angles.’
‘If your walls are meeting at true right angles so that the room is a perfect square or rectangle, you can omit this step.’
‘Give to a philosopher the concept of a triangle, and let him discover in his own way what the relation of the sum of its angles to a right angle might be.’
‘If your site includes any corners or other right angles, look for stone that already shows this shape.’
‘They used two sticks in the form of a cross, viewing astronomical objects through the right angle formed by the sticks.’
‘She's leaning, in the right of the photo, against a store's glass window that makes a right angle at the corner of the street.’
‘The sum of the angles of a triangle is equal to two right angles.’
‘For example there is a fairly straightforward method to trisect a right angle.’
‘What we often don't realize is that, in some parts of the world even today, people are not accustomed to seeing straight lines and right angles.’
‘It follows that on the earth's surface there is an equilateral triangle with all its angles equal to a right angle.’
‘It's probably the same size as my current bedroom, but doesn't have the complete lack of right angles that makes my room a living hell to arrange furniture in, which is a plus.’
‘The double building in the right angle of the square is the Black Bull Hotel.’
‘He discovered that the sum of the angles of a triangle are two right angles and, when his father found out, he relented and allowed Blaise a copy of Euclid.’