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b. Obtuse

c. Scalene

d. Right

2. The _______ angle measures equal to two right angles.

a. Complete

b. Right

c. Acute

d. Straight

3. A straight angle always measure _____ degree.

a. 90

b. 0

c. 180

d. 270

4. Three-fourth of a complete angle is a ________ angle.

a. Straight

b. Right

c. Obtuse

d. Reflex

5. One-third of a right angle is a _______ angle.

a. Acute

b. Right

c. Obtuse

d. Zero