Angle — 145° (Obtuse Angle) — free printable diagram

What is a 145 degree angle?

A 145 degree angle (145°) is an obtuse angle — it measures more than 90° but less than 180°, so the opening is wider than a square corner but has not yet opened into a straight line. This diagram shows 145° opened between two arms meeting at a vertex.

Measure

145°

Type of angle

Obtuse angle

Supplement (adds to 180°)

35°

Reflex angle on the other side

215°

In radians

29π/36 (≈2.531)

Fraction of a full turn

29/72 of a turn

• A 145° angle is an obtuse angle because it measures more than 90° but less than 180°, so the opening is wider than a square corner but has not yet opened into a straight line.
• Angles on a straight line add up to 180°, so the angle next to this one measures 180° − 145° = 35°.
• Angles round a point add up to 360°, so the reflex angle on the other side of these arms measures 360° − 145° = 215°.
• To measure or draw it, put the centre of the protractor on the vertex where the two arms meet, line one arm up with the 0° mark, and read the scale that starts at 0° on that arm until you reach 145°.
• In radians, 145° × π/180 = 29π/36, which is about 2.531.