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Q.

An angle that is 10 less than right angle is:


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a

Reflex angle

b

Straight angle

c

Obtuse angle

d

Acute angle 

answer is D.

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Detailed Solution

Concept: Using basic knowledge about different types of angles and range of degrees of each one.Angles with measures between 0 and 90 degrees or less than 90 degrees radian are referred to as acute angles in geometry and mathematics. When a triangle is described as an acute triangle, it signifies that none of its angles are more than 90 degrees.
Reflex angle: It is an angle which is more than 180°  but less than 360°.
Straight angle: An angle which is equal to 180°  is called a straight angle.
Acute angle: It is an angle which lies between 00 and 900. That is, more than 00 and less than 900.
Obtuse angle: It is angle which is more than  900 but less than 180°.
 Here,
10 less than right angle, i.e., 900 will be:
900- 10 = 890 
Which is less than 900 and lies in the region between 00 and 900.
Hence, the correct answer is option 4.
 
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