C-10-Q069mediumsingle_mcq

The reasoning that the depression angle at $B$ equals $\angle ACB$ at $C$ uses the fact that the two horizontal lines at $B$ and at $C$ are—

aperpendicular
bparallel
cintersecting
dcoincident

ব্যাখ্যা

The horizontal lines at $B$ and $C$ are both level (perpendicular to the vertical), so they are parallel to each other. Equal alternate angles only arise when a transversal cuts two parallel lines.

এই অধ্যায়ের আরও প্রশ্ন

C-10-Q070Angle of depression from a higher point and angle of elevation from a lower point form—
C-10-Q071Building height , , with . Then equals—
C-10-Q072From the equation , we get
C-10-Q073Moving back m to point gives elevation , so equals—
C-10-Q074Therefore also equals—
C-10-Q075Combining gives
C-10-Q076Hence approximately equals—
C-10-Q077Rationalizing, is equivalent to—
C-10-Q078As the observer moves backwards on level ground, the angle of elevation of a fixed building top—
C-10-Q079The pole stands , breaks without separation, and the broken piece slopes down to at distance m, with . From ,

Chapter 10: Distance and Elevation — সব প্রশ্ন দেখুন (160টি) →

The reasoning that the depression angle at BBB equals ∠ACB\angle ACB∠ACB at CCC uses the fact that the two horizontal lines at BBB and at CCC are—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The reasoning that the depression angle at BBB equals ∠ACB\angle ACB∠ACB at CCC uses the fact that the two horizontal lines at BBB and at CCC are—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The reasoning that the depression angle at $B$ equals $\angle ACB$ at $C$ uses the fact that the two horizontal lines at $B$ and at $C$ are—

The reasoning that the depression angle at $B$ equals $\angle ACB$ at $C$ uses the fact that the two horizontal lines at $B$ and at $C$ are—