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From a point at a height of 30 metre fro...

From a point at a height of 30 metre from the water level of a lake the angle of elevation of an aeroplane is `30^@` and the angle of depression of the shadow of the aeroplane in water of the lake is `60^@`. What is the height of the aeroplane from the water surface of the lake?

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UNITED BOOK HOUSE-GARDEN REACH BIHARI DAS GIRL'S -EXERCISE
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  2. If x/y= (a+2)/(a-2) show that (x^2-y^2)/(x^2+y^2)=(4a)/(a^2+4)

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  3. Answer any one : If a/b+c = b/c+a = c/a+b, then prove that each ratio...

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  6. In triangleABC, anglaBAC = 90^@ , if CD is a median of triangleABC, th...

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  7. AC is a diamter of a circle with centre O, If triangleABC is cyclic an...

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  8. Construct an equilateral triangle with side 6 cm. Draw the in circle o...

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  9. Draw a cricle with centre at O having the length of radius 2.5 cm. Tak...

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  10. Find the value of sin^2 pi/3-sec^2 pi/4-cosec^2 pi/4+ cot pi/4.

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  13. The heights of two towers are h1 metre and h2 metre. If the angle of e...

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  14. From a point at a height of 30 metre from the water level of a lake th...

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  15. Each side of a cube is decreased by 50%. Calculate the ratio of the vo...

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  17. If two solid spheres with the radii of 1 cm and 6 cm lengths are melte...

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  18. If the median of the given data is 32, then find the value of x and y ...

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  19. Find the mean of the following frequency distribution table.

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