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Questions  

Area of the quadrilateral formed by drawing tangents at the ends of latusrecta of x24+y21=1 is

a
163
b
83
c
43
d
43

detailed solution

Correct option is A

Given ellipse is x24+y21=1 Here a=2,b=1e=a2−b2a2=4−14=32 Now, end point of latusrectum =Pae,b2a=P3,12 Equation of tangent is S1=0⇒3x+2y=4 Area of quadrilateral =4×△AOB=4×162|3×2|=163

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