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1 . Bisectors of two adjacent angles Aand Bof a quadrilateral ABCDintersect each other at a point P. Which one of the following is correct ?
A.  2∠APB= ∠C + ÐD
B.  ∠APB = ∠C+ ∠D
C.  ∠APB=180° – (∠C+ ∠B)
D.  ∠APB=180° – (∠C+ ∠D)
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2 .
A.  20°
B.  30°
C.  35°
D.  40°
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3 . The diameter of two circles are 18 cm and 8 cm. The distance between their centres is 13 cm. What is the number of common tangents?
A.  1
B.  2
C.  3
D.  None of These