Ren Qian was at a height of 10 meters to the ground. Let the distance from her vertical point on the ground to her family (i.e the ground distance) be represented by x.

But the angle of depression is measured with respect to the horizontal plane, so;

the vertical angle = $90^{o}$ - 20°

= $70^{o}$

Applying the appropriate trigonometric function, we have;

Tan θ = $\frac{opposite}{adjacent}$

Tan $70^{o}$ = $\frac{x}{10}$

⇒ x = 10 x Tan $70^{o}$

= 10 x 2.7475

= 27.475

x = 27.5 meters

Ren was 27.5 meters away from her family.

6 0

3 years ago

Which expression has the same value as the sum of 45 and 25?

MariettaO [177]

Is there any choices

8 0

3 years ago

If -2 is the root of the quadratic equation x^2-5x+c=0 find the value of c​

If -2 is the root of the quadratic equation x^2-5x+c=0 find the value of c