Course / Category - 9th Foundation NTSE

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NTSE

9th Foundation NTSE

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NTSE

9th Foundation NTSE

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Self Learning

Available

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MOCK TESTS

(Click here to attempt Free Mock Test)

Concepts Learning Progress

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Course Progess

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Maths, Physics, Chemistry, Biology, English, History, Democratic Politics, Geography, Economics, Verbal Reasoning, Non Verbal Reasoning, Vedic Maths

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Maths / Lines and Angles / Complementary Angles

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Complementary Angles

When the sum of two angles is 90° then they are said to be Complementary Angles.

Two Angles are Complementary when they add up to 90 degrees (a Right Angle)

Complementary Angle

Illustration: Find the complement of 60, 55 and 82.

Solution: Let the angles be x, y and z

X + 60 = 90. Hence x = 90 - 60 = 30

Y + 55 = 90. Hence x = 90 - 55 = 35

Z + 82 = 90. Hence x = 90 - 82 = 8

Illustration: Two angles are complementary. If one angle is two times the sum of other angle and 3, find the two angles.

Solution: Let the angle be x and its complementary be 90 - x

According to question: 90 - x = 2(x + 3)

OR 90 - x = 2x + 6

OR - x - 2x = 6 - 90

OR 3x = 84

x = 28

The angles are 28 and 62 are complementary angles.

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Complementary Angles

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Taxes