4th Grade Measuring and Drawing Angles Quiz: 10 Questions with Explanations

A 180°B 90°C 360°D 270°

A full turn is 360°, so half of it is 180°. A quarter turn is 90°.

A \(\frac{1}{100}\)B \(\frac{1}{360}\)C \(\frac{1}{180}\)D \(\frac{1}{90}\)

A circle has 360 one-degree slices, so one degree is 1/360 of the circle.

A 70°B 110°C 20°D 80°

One ray is on zero, so use the scale that starts at 0 there. The other ray crosses 70. The 110 is on the other scale.

A AcuteB ObtuseC RightD Straight

145° is greater than 90° and less than 180°, so it is obtuse.

A 85°B 11°C 75°D 95°

Add the parts: 48 + 37 = 85. Subtracting gives 11, which is not what the question asks.

A 124°B 66°C 46°D 56°

A right angle is 90°, so 90 – 34 = 56. Adding 90 + 34 = 124 is a common slip.

A 65°B 305°C 55°D 45°

A straight line is 180°, so 180 – 125 = 55. Using 90 instead of 180 gives a wrong answer.

A 30°B 6°C 120°D 60°

A full circle is 360°, and 360 ÷ 6 = 60. Dividing by 12 would give 30.

A 90°B 270°C 180°D 360°

From 12 to 9 is 9 numbers: 9 × 30 = 270. It is a three-quarter turn.

A 90°B 38°C 112°D 180°

An obtuse angle is greater than 90° and less than 180°. 90° is right, and 180° is a straight angle.