C-10-Q059mediumsingle_mcq

A ladder of length $18$ m leans against a wall making $45^\circ$ with the ground; with $AC=18$ m and wall height $AB=h$ , $\sin 45^\circ$ equals—

a $\dfrac{h}{18}$
b $\dfrac{18}{h}$

ব্যাখ্যা

Sine equals the opposite side over the hypotenuse. The wall height $AB=h$ is opposite the $45^\circ$ angle and the ladder $AC=18$ is the hypotenuse, so .

59/160

এই অধ্যায়ের আরও প্রশ্ন

C-10-Q060Therefore the wall height equals—
C-10-Q061in surd form equals—
C-10-Q062The approximate wall height in Example 3 is—
C-10-Q063The horizontal distance from the foot of the wall to the foot of the ladder is—
C-10-Q064In a –– right triangle, the two legs are—
C-10-Q065The stick contacts the tree at m above the ground; the depression angle at the contact is . By alternate angle
C-10-Q066From right with stick as hypotenuse, equals—
C-10-Q067Therefore equals—
C-10-Q068The length of the stick in Example 4 is—

\dfrac{h}{AC}

h \cdot 18

\sin 45^\circ=\dfrac{h}{18}

sin 4 5^{\circ} = \frac{h}{18}

C-10-Q069The reasoning that the depression angle at equals at uses the fact that the two horizontal lines at and at are

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

A ladder of length 181818 m leans against a wall making 45∘45^\circ45∘ with the ground; with AC=18AC=18AC=18 m and wall height AB=hAB=hAB=h, sin⁡45∘\sin 45^\circsin45∘ equals—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

A ladder of length $18$ m leans against a wall making $45^\circ$ with the ground; with $AC=18$ m and wall height $AB=h$ , $\sin 45^\circ$ equals—