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80% of an angle is the supplement of 140...

80% of an angle is the supplement of `140^(@)`. Find the angle

A

`40^(@)`

B

`50^(@)`

C

`70^(@)`

D

`80^(@)`

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The correct Answer is:
B
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ICSE-LINES AND ANGLES-Exercise 17A
  1. Write the complement of each of the following angles: 34^(@) 27^@

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  2. Write the complement of each of the following angles: 42^(@) 36'25''

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  3. Write the supplement of each of the following angles: 58^(@)

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  4. Write the supplement of each of the following angles: 105^(@)

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  5. Write the supplement of each of the following angles: 0.6 of a right...

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  6. Write the supplement of each of the following angles: (x-30)^(@)

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  7. Write the supplement of each of the following angles: 62^(@) 56'

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  8. Write the supplement of each of the following angles: 83^(@) 45'30''

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  9. If x^(@) and (x + 30)^(@) are complements of each other, find the valu...

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  10. If z^(@) and (z + 50)^(@) are supplements of each other, find the valu...

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  11. Two complementary angles are in the ratio 4:5. Find the angles

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  12. Two supplementary angles are in the ratio 7: 8. Find the angles

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  13. 25% of an angle is the complement of 50^(@). Find the angle

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  14. 80% of an angle is the supplement of 140^(@). Find the angle

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  15. An angle is double its complement. Find the angle

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  16. The measure of an angle is 20^(@) more than its complement. Find the m...

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  17. The measure of an angle is 30^(@) less than its supplement. Find the m...

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  18. Find an angle which is two-thirds of its complement

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  19. Find an angle which is one-fifth of its supplement

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  20. Find the an angle which is 5^(@) more than four times its supplement

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