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No 24
<ABD =180 - (4x+20 )
= 180 - 4x - 20
= 160 - 4x
<CDE = 180 - (4x-5)
= 180-4x+5
= 185-4x
<BCD+<ABD+<CDE=180 derajat
35 + 160 - 4x + 185 - 4x = 180
380 - 8x = 180
380 - 180 = 8x
200 = 8x
200/8 = x
25 = x
<BCD = 185 - 4x
= 185 - 4(25)
= 185 - 100
= 85 derajat