ABC = 90
ABD + BDC = 90
(2x + 8) + (x + 13) = 90
3x + 21 = 90
3x = 69
x = 23
ABD = 2x + 8
ABD = 2(23) + 8
ABD = 46 + 8
ABD = 54
Maaf kalau salah, silahkan dicek lagi
2a+8+a+13=90
3a+21=90
3a=69
a=23
sudut ABD=2(23) +8=46+8=54
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ABC = 90
ABD + BDC = 90
(2x + 8) + (x + 13) = 90
3x + 21 = 90
3x = 69
x = 23
ABD = 2x + 8
ABD = 2(23) + 8
ABD = 46 + 8
ABD = 54
Maaf kalau salah, silahkan dicek lagi
2a+8+a+13=90
3a+21=90
3a=69
a=23
sudut ABD=2(23) +8=46+8=54