Properties of Triangles 1 Question 11

11. In a ABC,B=π3 and C=π4. Let D divides BC internally in the ratio 1:3, then sinBADsinCAD is equal to

(a) 16

(b) 13

(c) 13

(d) 23

(1995, 2M)

Objective Questions II

(One or more than one correct option)

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Answer:

Correct Answer: 11. (a,b,c,d)

Solution:

  1. In ABD, applying sine rule, we get

ADsinπ/3=xsinαAD=32xsinα

and in ACD, applying sine rule, we get

ADsinπ/4=3xsinβAD=32xsinβ

From Eqs. (i) and (ii), 3x2sinα=3x2sinβ

sinαsinβ=16



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