Basics of Geometry - Examples (with Solutions), Geometry, Quantitative Reasoning Government Jobs Notes | EduRev
General Aptitude for GATE
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Based on the measurement, angles have been classified into different groups.
1. Complementary Angles
- Two angles taken together are said to be complementary if the sum of measurement of the angles equal to 90o.
- If ∠ A + ∠ B = 90o then ∠A is complementary of ∠B and vice versa.
2. Supplementary Angles
- Two angles are supplementary if the sum of their measure is 180o.
- If ∠ A + ∠ B = 180o then ∠A is supplementary of ∠B and vice – versa.
Try yourself:Two angles whose sum is equal to 180° are called: View Solution
- Two angles were drawn on the same point and have one arm common. The sum of these angles is 180o, then they are said to be linear pair of angles.
- ∠AOP and ∠POB are linear pair of angles.
- Two angles are adjacent if and only if they have one common arm between them.
- In the above figure, ∠ABC and ∠BCD are adjacent angles, since they have BC as their common arm.
- A line consists of infinite dots. A line is drawn by joining any two different points on a plane. Two different lines drawn can be either parallel or intersecting depending on their nature.
- If two lines intersect at a point, then they form two pairs of opposite angles (as shown in the figure), which are known as vertically opposite angles and have same measure. In the figure, ∠PRQ and ∠SRT are vertically opposite angles.
- Also, ∠QRS and ∠PRT are vertically opposite angles.
- Also, ∠x + ∠y = 180o and are Linear pair angles.
- An angle that has a measure of 90o is a right angle. If two lines intersect at right angles, the lines are perpendicular.
Example:
L1 and L2 above are perpendicular and denoted by L1 ⊥ L2.
- Two lines drawn on a plane are said to be parallel if they do not intersect each other. In the figure below lines, L1 and L2 are parallel and denoted by L1 || L2
- If a common line intersects two parallel lines L1 and L2, then that common line is known as transverse.
- Pair of corresponding angles = (∠1 & ∠5) and (∠4 & ∠ 6)
- Pair of internal alternate angles = (∠2 & ∠5)
- Pair of exterior alternate angles = (∠3 & ∠6)
- Vertically opposite angles = ∠3 & ∠4
- For parallel lines intersected by the transversal, the pair of corresponding angles, interior alternate angles and exterior alternate angles are equal.
- ∠1 = ∠5, ∠2 = ∠5, ∠3 = ∠6 and ∠3 = ∠4
Try yourself:If AB || CD, EF ⊥ CD and ∠GED = 135° as per the figure given below. The value of ∠AGE is:
View Solution
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