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sudur 1 = 3x
= 3 . =
sudut 2 = 2x - 19
= 2. - 19
=
sudut 3 = 4x + 10
= 4. + 10
=
3x+2x-19+4x+10= 180
9x -9 = 180
------------- ÷ 9
x-1 = 20
x= 21
besar sdut :
3x = 3.21 = 63
2x-19 = 2.21-19
= 42-19
= 23
4x+10= 4.21+10.
= 84+10
= 94