Angle — 65° (Acute Angle) — free printable diagram

What is a 65 degree angle?

A 65 degree angle (65°) is an acute angle — it measures less than 90°, so the opening is narrower than a square corner. This diagram shows 65° opened between two arms meeting at a vertex.

Measure

65°

Type of angle

Acute angle

Complement (adds to 90°)

25°

Supplement (adds to 180°)

115°

Reflex angle on the other side

295°

In radians

13π/36 (≈1.134)

Fraction of a full turn

13/72 of a turn

• A 65° angle is an acute angle because it measures less than 90°, so the opening is narrower than a square corner.
• Angles on a straight line add up to 180°, so the angle next to this one measures 180° − 65° = 115°.
• Two angles that add up to 90° are complementary, so the complement of 65° is 90° − 65° = 25°.
• Angles round a point add up to 360°, so the reflex angle on the other side of these arms measures 360° − 65° = 295°.
• 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 65°.
• In radians, 65° × π/180 = 13π/36, which is about 1.134.