Question

I want the answer of Q3.No irrelevant answer.Please tomorrow is my test.​

Answer 1

Answer:

Let the two points be A and B

A=(4 cosθ, 0), B=(0, 4 sinθ)

x1=4 cosθ, x2=0, y1=0, y2=4 sinθ

Distance between the point AB

$\sqrt{ {(x2 - x1)}^{2} + {y2 - y1)}^{2} }$

$\sqrt{ {(0 - 4 \: cosθ)}^{2} + {(4 \: sinθ - 0)}^{2} }$

$\sqrt{ {( - 4 \: cosθ)}^{2} + {(4 \: sinθ)}^{2} }$

$\sqrt{16 { \: cos}^{2}θ + 16 {sin}^{2}θ }$

$\sqrt{16( {cos}^{2} θ + {sin}^{2} θ)}$

$\sqrt{16 \times 1}$

$\sqrt{16}$

$4 \: units$