In engineering drawing, what angle do two radii form within a quadrant?
90°
A quadrant is one quarter of a full circle. Since a full circle at the centre subtends \(360^\circ\), one quarter is \(\frac{360^\circ}{4}=90^\circ\).
The two radii bounding a quadrant are drawn from the centre to the two ends of that quarter arc, so the angle between them equals the angle the quadrant subtends at the centre.
Therefore the two radii of a quadrant form a right angle of 90° between them.
Hence, the answer is 90°.
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