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7. DIK = <ABC = 3x' + 11'
<BCA = 4x' - 7 '
<CAB = 5x' - 16'
DIT = segitiga ABC berbentuk?
JWB = 3x' + 11' + 4x' -7' + 5x' - 16' = 180'
3x' + 4x' + 5x' = 180' - 11' + 7' +16'
12x' = 192'
x' = 192'
12'
x' = 16'
JADI,
<ABC = 3x' + 11'
3(16)' +11'
48' + 11'
59
<BCA = 4x' - 7'
4(16)' - 7'
64 ' - 7'
57'
<CAB = 5x' - 16'
5(16)' - 16'
80' - 16'
64'
BERBENTUK SEGITIGA ::: SEMBARANG