some important theorem of angles

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Sum of the angles of a triangle is equal to two right angles..

If two sides of a triangle are equal, the angles opposite to them are equa..

If two lines intersect, then the vertically opposite angles are congruen..

Theorem - Sum of the angles of a triangle is equal to two right angles. ABC is a triangle A + B + ACB = 180 o Produce BC to D. Through C draw CE || B..

Theorem 1 - If a straight line meets another straight line, the adjacent angles so formed are supplementary. A straight line CO meets straight line AB at ..

Statement - If a transversal intersects two parallel lines, then each pair of alternate angles are equa..

Statement - The sum of the three angles of a triangle is 180 o..

Some Important Aspects of Doppler Effect - When a source moves towards a stationary observer the apparent frequency, according to equation When the observer moves towards a stationary source, the apparent frequency, according to equation In both the cases, the apparent frequency is greate..

An angle is an amount of rotation of a half-line (or ray) in a plane about its end point from an initial position to a terminal position. The important terms are: Measurement of angle, Positive and Negative angles, Lines at right angles, Quadr..