Question

If ( is the angle subtended by double
ordinate at vertex of y? = 4ax then its
length is​

Answer 1

Answer:

Let PQ be the coordinate

Hence P has y-coordinate

=4a, as y

2

=4ax

⇒ x=

4a

y

2

=

4a

(4a)

2

=4a

In △OMP

tanθ=

4a

4a

=1

⇒ θ=45

o

⇒ ∠POQ=2θ=90

o