D 9. In the adjoining figure the side BC of is extended upto D. If the bisectores of ДАВС LABC and LACD meet in a point E then prove that 1 'ZBEC: = -ZBAC 2 Hint-Angle LABC) C sum of AABC = Angles sum of ABEC and ZACD = LBAC + angle ABC
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D 9. In the adjoining figure the side BC of is extended upto D. If the bisectores of ДАВС LABC and LACD meet in a point E then prove that 1 'ZBEC: = -ZBAC 2 Hint-Angle LABC) C sum of AABC = Angles sum of ABEC and ZACD = LBAC + angle ABC
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15. Mention (i) Any two acute angles (ii) any two obtuse angles and hence draw
them.
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