Angles Flashcards
1
Q
What is an acute angle ?
A
An angle that is less than 90°
2
Q
What is a right angle ?
A
An angle that is 90° exactly
3
Q
What is an obtuse angle ?
A
An angle that is greater than 90° but less than 180°
4
Q
What is a straight angle ?
A
An angle that is 180° exactly
5
Q
What is a reflex angle ?
A
An angle that is greater than 180°
6
Q
What fraction of a straight angle is a right angle?
A
One-half
7
Q
How many right angles are there in 540° ?
A
A right angle is 90°
and
6 × 90 = 540
So 540° is 6 right angles
8
Q
At which one of the following times is the angle between the hands of a clock exactly one right angle?
a: 12:15
b: 3:00
c: 3:30
d: 6:45
A
3:00
9
Q
BC is parallel to DE.
What is the length of AC?
A: 2.5
B: 2.7
C: 3
D: 7.5
A
B: 2.7
Use the Side-splitter theorem:
