QUADRILATERAL

VITEEE 2015 Coaching › Class VII-X Mathematics questions › QUADRILATERAL

Quadrilateral ABCD has AB=BC=CD, ANGLE ABC=70degees ,and ANGLE BCD=170degree.WHAT IS THE MEASURE OF ANGLE BAD?

#Mathematics #Class VII-X Mathematics

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7 Answers

36

rahul ·2011-02-04 00:04:41

Question is absolutely wrong........!!

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oishitmitra ·2011-08-23 06:19:46

yes Aritra...u r absolutly wrong...try working out the problem urslf...u will understand..

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11

Sambit Senapati ·2011-08-25 01:41:15

IS the answer is 85Â°?

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36

rahul ·2011-08-25 15:55:35

sorry bhai...!! Actually at that time i was a dumbo...

I just joined AC and BD
and thus assigned the angles

Consider Triangles ACD and ABD

From triangle ABD

r/sin(60Â° - Î˜) = q/sin65Â° ---- (i)

and from triangle ACD

r/sinÎ˜ = q/sin115Â° ---- (ii)

dividing (i) by (ii) we get,

sinÎ˜/sin(60Â°-Î˜) = sin115Â°/sin65Â°

or, sinÎ˜ = sin(60Â°-Î˜)

as Î˜<90Â° so, Î˜ = 30Â°

Thus, LBAD = 55Â° + 30Â° = 85Â°

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Sambit Senapati ·2011-08-26 04:48:16

@rahulmishra-You were the one who said the question is wrong, right?

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36

rahul ·2011-08-26 11:41:42

yup :p

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Rashmuni hansda ·2012-06-14 05:38:33

According to drawing ANGEL BAD will be 85 Degree.

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