Angles
Definition - When two straight lines meet at a point they form an angle. The point at which the arms meet (O) is known as the vertex of the angle. The amount of turning from one arm (OA) to other (OB) is called the measure of the angle ( AOB) and written as m AOB. An h..
Definition - When two straight lines meet at a point they form an angle. The point at which the arms meet (O) is known as the vertex of the angle. The amount of turning from one arm (OA) to other (OB) is called the measure of the angle ( AOB) and written as m AOB. An h..Supplementary angles
Two angles are said to be supplementary, if the sum of their measures is 180 o..
Supplementary angles
They are a pair of angles, the sum of whose measures is equal to 180 o . These may be adjacent angles as well. [See figure below] [See figure below] (non-adjacent angles..
They are a pair of angles, the sum of whose measures is equal to 180 o . These may be adjacent angles as well. [See figure below] [See figure below] (non-adjacent angles..Complementary and Supplementary angles
If the sum of the two angles is one right angle (i.e., 90 o ), they are called complementary angles..
Which pair of exterior angles are supplementary?
Which pair of exterior angles are supplementary? => ∠ 10, ∠ 8 or ∠ 5, ∠ 8 or ∠ 11, ∠ 12 or ∠ 4, ∠ 6..
Two angles are supplementary and one angle is obtuse. The other angle ..
Two angles are supplementary and one angle is obtuse. The other angle must be ______________. => obtuse or right angle or straight angle or acute..
Linear pair of adjacent supplementary angles
If a pair of angles are adjacent as well as supplementary then they are said to form a linear pair. are adjacent angles, and [See figure below..
If a pair of angles are adjacent as well as supplementary then they are said to form a linear pair. are adjacent angles, and [See figure below..Aid to memorise the table for standard angles:
(a) Write 0, 1, 2, 3, 4 over each column as shown above. (b) Divide each number by 4 and take the square root. The values obtained are sine ratios. (c) Write these ratios in reverse order and you obtain the cosine ratios (sin A = cos B if A + B = 90 o ) (d) Divide each sine ratio by cosine ratio a..
(a) Write 0, 1, 2, 3, 4 over each column as shown above. (b) Divide each number by 4 and take the square root. The values obtained are sine ratios. (c) Write these ratios in reverse order and you obtain the cosine ratios (sin A = cos B if A + B = 90 o ) (d) Divide each sine ratio by cosine ratio a..If two supplementary angles are congruent, then find the value of each..
If two supplementary angles are congruent, then find the value of each. => 0° or 90° or 180° or 45°..
Identify the figure in which the pairs of angles are not supplementary..
Identify the figure in which the pairs of angles are not supplementary. => Figure 1 only or Figure 2 only or Figure 3 only or Figure 1 and Figure 2..
Result
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