C-10-Q065mediumsingle_mcq

The stick contacts the tree at $AB=7$ m above the ground; the depression angle at the contact is $30^\circ$ . By alternate angles, $\angle ACB$ equals—

a $60^\circ$
b $30^\circ$
c $45^\circ$
d $90^\circ$

ব্যাখ্যা

The angle of depression at $B$ and $\angle ACB$ at $C$ are alternate angles formed by the horizontal line and the line $BC$ crossing two parallel horizontals. Alternate angles are equal, so $\angle ACB=30^\circ$ .

এই অধ্যায়ের আরও প্রশ্ন

C-10-Q066From right with stick as hypotenuse, equals—
C-10-Q067Therefore equals—
C-10-Q068The length of the stick in Example 4 is—
C-10-Q069The reasoning that the depression angle at equals at uses the fact that the two horizontal lines at and at are
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

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

The stick contacts the tree at $AB=7$ m above the ground; the depression angle at the contact is $30^\circ$ . By alternate angles, $\angle ACB$ equals—

60^\circ

30^\circ

45^\circ

90^\circ

The stick contacts the tree at AB=7AB=7AB=7 m above the ground; the depression angle at the contact is 30∘30^\circ30∘. By alternate angles, ∠ACB\angle ACB∠ACB equals—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The stick contacts the tree at AB=7AB=7AB=7 m above the ground; the depression angle at the contact is 30∘30^\circ30∘. By alternate angles, ∠ACB\angle ACB∠ACB equals—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The stick contacts the tree at $AB=7$ m above the ground; the depression angle at the contact is $30^\circ$ . By alternate angles, $\angle ACB$ equals—

The stick contacts the tree at $AB=7$ m above the ground; the depression angle at the contact is $30^\circ$ . By alternate angles, $\angle ACB$ equals—