What is the radius of the resultant circle, if its diameter is decreas..
What is the radius of the resultant circle, if its diameter is decreased by half? => 1 4 or r 2 or r 4 or - 1 4..
Estimate the length of the straw to the nearest half-inch.
Estimate the length of the straw to the nearest half-inch. => 6 1 2 inches or 6 1 5 inches or 6 1 4 inches or 7 inches..
Name the angle.
Name the angle. => an acute angle or a straight angle or an obtuse angle or a right angle..
Measurement of Angles
Measurement of Angles - To measure an angle we shall use two kinds of units, the degree unit and the radian un..
Obtuse angle
An angle whose measure is more than one right angle and less than two right angles (i.e., less than 180 o and more than 90 o ) is called an obtuse angle..
An angle whose measure is more than one right angle and less than two right angles (i.e., less than 180 o and more than 90 o ) is called an obtuse angle..Acute Angle
An angle whose measure is less than 90 o is called an acute angle..
An angle whose measure is less than 90 o is called an acute angle..Straight angle
An angle whose measure is 180 o is called a straight angle..
An angle whose measure is 180 o is called a straight angle..Bisector of an angle
If a ray or a straight line passing through the vertex of that angle, divides the angle into two angles of equal measurement, then that line is known as the Bisector of that angle. ..
If a ray or a straight line passing through the vertex of that angle, divides the angle into two angles of equal measurement, then that line is known as the Bisector of that angle. ..Alternate angles
A pair of angles are said to be alternate angles if (i) both are interior angles (ii) they are on the opposite sides of the transversal and (iii) they are not adjacent angles. Alternate angles are some times also called alternate interior an..
A pair of angles are said to be alternate angles if (i) both are interior angles (ii) they are on the opposite sides of the transversal and (iii) they are not adjacent angles. Alternate angles are some times also called alternate interior an..Critical angle
is that angle of incidence for which a ray of light while moving from a denser to a rarer medium just grazes over the surface of separation of the two media (that is, angle of refraction = 90 o ..
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