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EF = ( AF x CD + CF x AB ) / ( CF + FB )
= ( 4x6 + 2x9) / ( 4+2)
= ( 24 + 18 ) / 6
= 42/6
= 7 jawabnnya C
nomer 28
2x + 3 + 3x - 8 = 180
5x - 5 = 180
5x = 180 + 5
x = 185/5
x = 37
CBD = 3(37) - 8
= 111-8
= 103 jawabannya D
EF= 6.4 + 2.9/2+4
=24 + 18 / 6
= 42 / 6
= 7 (c)
28.
ABC + CBD = 180
2x+3 + 3x-8 = 180
5x -5 = 180
5x = 180 + 5
x= 185 / 5 = 37
CBD = 3x -8 = 3. 37 - 8 = 111 - 8 = 103