Title: Math 7 Angles
Course: quiz duplicate error

Q: Fill in the blank.

[Image] angle measures between 0° and 90°.
- An obtuse (Obtuse angles are more than 90°)
- An acute (correct)
- A straight (Straight angles are 180°)
- A right (Right angles are exactly 90°. What do you call an angle that is smaller than 90°?)
A: An acute

Q: Fill in the blank.

The measure of a right angle is [Image].
- between 90° and 180° (incorrect)
- 90° (correct)
- between 0° and 90° (incorrect)
- 80° (incorrect)
A: 90°

Q: Classify the angle as acute, right, obtuse, or straight.

[Image]
- Obtuse (Obtuse angles are more than 90°. This angle is less than that.)
- Acute (correct)
- Right (Right angles are exactly 90°. This angle is less than that.)
- Straight (Straignt angles measure 180°. This angle is less than that.)
A: Acute

Q: Classify the angle as acute, right, obtuse, or straight.

[Image]
- Right (Right angles are 90°. This angle is more than that.)
- Straight (correct)
- Acute (Acute angles are less than 90°. This angle is more than that.)
- Obtuse (Obtuse angles are greater than 90° but less than 180°. Isn't this angle equal to 180°?)
A: Straight

Q: Tell whether the angle is acute, right, obtuse, or straight.

∠ADB
   [Image]
- Acute (correct)
- Right (incorrect)
- Straight (incorrect)
- Obtuse (∠ADC is obtuse, but the question asked about ∠ADB)
A: Acute

Q: Classify the angle as acute, right, obtuse, or straight.

[Image]
- Obtuse (correct)
- Straight (This angle is not 180°)
- Acute (Acute angles are less than 90°. This angle is more than that.)
- Right (This angle is not 90°.)
A: Obtuse

Q: Classify the angle as acute, right, obtuse, or straight.

[Image]
- Straight (This angle is not 180°)
- Right (This angle is not 90°)
- Acute (correct)
- Obtuse (Obtuse angles are more than 90°. This angle is less than that.)
A: Acute

Q: Classify the angle as acute, right, obtuse, or straight.

[Image]
- Right (correct)
- Acute (Acute angles are less than 90°. This angle is exactly 90°.)
- Straight (incorrect)
- Obtuse (Obtuse angles are more than 90°. This angle is exactly 90°.)
A: Right

Q: Tell whether the angle is acute, right, obtuse, or straight.

[Image]
- Acute (This angle is not less than 90°.)
- Straight (This angle is not equal to 180°.)
- Obtuse (correct)
- Right (This angle is not equal to 90º.)
A: Obtuse

Q: Tell whether the angle is acute, right, obtuse, or straight.

∠ADB
   [Image]
- Obtuse (correct)
- Straight (∠CDB is a straight angle. The question asked about ∠ADB.)
- Acute (∠ADC is acute. The question asked about ∠ADB.)
- Right (None of the angles in the figure measure 90°.)
A: Obtuse

Q: Tell whether the angle is acute, right, obtuse, or straight.

∠ADB
   [Image]
- Straight (correct)
- Acute (∠ADC is acute. The question asked about ∠ADB.)
- Right (None of the angles in the figure equal 90°.)
- Obtuse (∠CDB is obtuse The question asked about ∠ADB.)
A: Straight

Explain how to find the measure of the angle that is supplementary to a 56° angle:
Feedback: Subtract 56 degrees from 180 degrees.

Q: What is the measure of the angle that is complementary to a 45° angle?
- 45° (correct)
- 225° (Incorrect. Complementary angles add up to 90°.)
- 315° (Incorrect. Complementary angles add up to 90°.)
- 135° (That is the measure of the supplementary angle. Complementary angles add up to 90°.)
A: 45°

Q: Identify the pairs of supplementary angles.
[Image]
- ∠ABD and ∠EBF (Those two angles are vertical angles. Their measures don't add up to 180°.)
- ∠ABE and ∠DBF (Those two angles are vertical angles. Their measures don't add up to 180°.)
- ∠ABE and ∠ABD; ∠ABE and ∠EBF; ∠DBF and ∠EBF; ∠DBF and ∠ABD (correct)
- There are no pairs of supplementary angles. (Look again. If two angles form a line together, they are supplementary.)
A: ∠ABE and ∠ABD; ∠ABE and ∠EBF; ∠DBF and ∠EBF; ∠DBF and ∠ABD

Q: What is the measure of the angle that is complementary to a 72° angle.
- 18° (correct)
- 198° (Incorrect. Subtract 72° from 90° to find the right answer.)
- 288° (Incorrect. Subtract 72° from 90° to find the right answer.)
- 108° (That is the measure of the angle supplementary to 72°. Complementary angles add up to 90°.)
A: 18°

Q: What is the measure of the angle that is supplementary to a 151° angle?
- 119° (Incorrect. Subtract 151° from 180° to find the right answer.)
- 209° (Incorrect. Subtract 151° from 180° to find the right answer.)
- 29° (correct)
- not possible (It is possible. Supplementary angles add up to 180°.)
A: 29°

Q: What is the measure of the angle that is supplementary to a 107° angle?
- 163° (Incorrect. Subtract 107° from 180° to get the right answer.)
- 253° (Incorrect. Subtract 107° from 180° to get the right answer.)
- 73° (correct)
- not possible (It is possible. Supplementary angles add up to 180°.)
A: 73°

Q: A roof is inclined at an angle of 21.32°. Find the measure of the angle that is complementary to this angle.
- 68.68° (correct)
- 68.78° (Careful! Check your calculation again.)
- 69.78° (Careful! Check your calculation again.)
- 69.68° (Careful! Check your calculation again.)
A: 68.68°

Q: What is the measure of the angle that is supplementary to a 40° angle?
- 320° (Incorrect. Supplementary angles add up to 180°.)
- 230° (Incorrect. Supplementary angles add up to 180°.)
- 50° (Incorrect. Supplementary angles add up to 180°.)
- 140° (correct)
A: 140°

Q: Identify the pair or pairs of complementary angles.

[Image]
- ∠DBE and ∠EBF (That is one pair. There is another.)
- ∠ABD and ∠FBC; ∠DBE and ∠EBF (correct)
- ∠ABD and ∠EBF; ∠DBE and ∠FBC (Incorrect. Look for pairs of angles that add up to 90 degrees.)
- ∠ABD and ∠FBC (That is one pair. There is another.)
A: ∠ABD and ∠FBC; ∠DBE and ∠EBF
Partly right: ∠DBE and ∠EBF (50%); ∠ABD and ∠FBC (50%)