tolong di jawab nya nomor 20,21,22,23 pakai cara yy terima kasih butuh sekarang jawaban nya..........

sudut a = 1/2 sp
1/2 sp + sp = 90
1 1/2 sp = 90
sp = 60 ○
sudut a = 60 : 2 = 30○

7a + 2a = 90
a = 10 ○
2a = 20○

3x+3X+4X = 180
x = 18○
4x = 72○

5/6 putaran
1 putaran = 360 ○

5/6 x 360 = 300○