Trigonometric Tables
ICSE · Class 10 · Mathematics
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Convert 25.4° into degrees and minutes.
How many seconds are there in 1 minute?
Convert 42° 30' into decimal degrees.
If sin 30° = 0.5000, what is sin 30° using trigonometric tables notation?
Sample Questions
Which of the following are correct angle conversions? (Select all that apply)
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1° = 60', 1' = 60'', 30' = 0.5°
Standard angle conversions: 1° = 60', 1' = 60'', and 30' = 30/60 = 0.5°. Note that 1° = 3600'' (not 60''), and 90' = 1.5° (not 1°).
Convert 15.25° into degrees, minutes, and seconds.
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15° 15' 0''
0.25° = 0.25 × 60 = 15'. Since there's no further decimal part, seconds = 0. Therefore, 15.25° = 15° 15' 0''.
What is the standard notation for 1 degree, 1 minute, and 1 second?
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1°, 1', 1''
Standard notation: degrees are written with °, minutes with ', and seconds with ''.
How many columns are there in a standard trigonometric table?
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12
A trigonometric table has 12 columns: 1 for degrees, 10 for minute intervals (0', 6', 12', etc.), and 1 for mean differences.
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