Wednesday

September 24, 2014

September 24, 2014

Posted by **vad** on Tuesday, January 4, 2011 at 12:57pm.

- trigonometry -
**drwls**, Tuesday, January 4, 2011 at 1:36pmLet H be the altitude (which you already know), and D be the horizontal distance from the plane to the nearest bank of the river. Let w be the width of the river.

H/D = tan 60

H/(D + w) = tan 45

Not that the second equation implies that

H = D + w

and the first equation implies that

H = sqrt3 * D

Solve for w in terms of H, using substitution to eliminate D.

H = H/sqrt3 + w

H(1 - 1/sqrt3) = w

- trigonometry -
**Sbulu**, Tuesday, February 18, 2014 at 2:25amShut up

**Answer this Question**

**Related Questions**

trig - From two points each on the opposite sides of a river,the angles of ...

trigonometry - From the top of a hill 700 ft high an observer notes that the ...

MATHS - TWO OPPOSITE ANGLES OF A PARALLELOGRAM ARE (3X-2)DEGREE AND (50-X)DEGREE...

trigonometry - From a mountain 1780 ft. high, the angle of depression of a point...

trigonometry - a space shuttle pilot flying toward the suez canal finds that the...

Geometry/Algebra - Two opposite angles of a parallelogram are (5x-2)degree and (...

trigonometry - the bases of a trapezoid are 22 and 12 respectively. The angles ...

Math11U - A surveyor in an airplane observes that the angle of depression to two...

Math - Trigonometry - From an aeroplane, at an altitude of 2.3km, the angle of ...

trig - From the top of a hill 700 ft. high, an observer notes that the angles of...