Mathematics
At a certain time of day, the ratio of the height of the pole to the length of its shadow is 1 : , then the angle of elevation of the sun at that time of the day is :
30°
45°
60°
90°
Heights & Distances
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Answer
Let AB be the pole and BC be the shadow and angle of elevation of Sun be θ.
From figure,
⇒ tan θ =
⇒ tan θ =
⇒ tan θ =
⇒ tan θ = tan 30°
⇒ θ = 30°.
Hence, Option 1 is the correct option.
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Assertion (A) : The difference in class marks of the modal class and the median class of the following frequency distribution table is 0.
Class interval Frequency 20-30 1 30-40 3 40-50 2 50-60 6 60-70 4 Reason (R) : Modal class and median class are always the same for a given frequency distribution.
Both A and R are correct, and R is the correct explanation for A.
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A is true, but R is false.
Both A and R are true.