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vivek

· started a discussion

· 1 Months ago

vivek (Question: 186644.0 )

acc to which concept u made this equation

Question:

Quadrilateral ABCD is circumscribed about a circle. If the lengths of AB, BC, CD are 7 cm, 8.5 cm and 9.2 cm respectively, then the length of DA is –

Options:
A) 10.7 cm
B) 7.2 cm
C) 16.2 cm
D) 7.7 cm
Solution:

Ans: (D) 

ATQ,

AB + CD = BC + DA

= 7 + 9.2 – 8.5

= 7.7 cm

Knowledge Expert

· commented

· 1 Months ago

@vivek

Two tangents from a point outside a circle to the circle are equal.

More: http://www.cut-the-knot.org/Curriculum/Geometry/Pitot.shtml

vivek

· commented

· 1 Months ago

@Knowledge Expert sir tell me the name of theorm

Knowledge Expert

· commented

· 1 Months ago

Hi Vivek, Just theorem has been applied there.
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