Tolong di jawab pertanyaan yang di lingkarkan pake cara jalan nya????

23. 180= 5a+2a+40+3a
180=10a+40
180-40=10a
140=10a
140/10=a
14=a

<plk =5a+2a+40
=(5×14)+(2×14)+40
=70+28+40
=138° (c)

24.
180 = 2x + 3x-10+90
180=2x+3x+80
180-80=5x
100=5x
100/5 =x
20=x

<pqs = 90+2x
= 90+(2×20)
= 90+40
= 130° (d)

27.
<A2=65°
<A1=180-65
=115°

A1=A3=B1=B3 = 115°
A2=A4=B2=B4 = 65°

A1+B2+B4
=115°+65°+65°
=245° (c)

28. 180=2x+3x
180=5x
180/5=x
36=x
A1=B3
B3=3x
=3×36
=108° (c)

27
<A1 + <A2 = 180
<A1 = 180-65 = 115
<B2 = <B4 = >A2 = 65

<A1 + <B2 + <B4 = 115 + 65 +65 = 245

28.
<A2 = 2x
<A1 = <B3 = 3x

<A1 + <A2 = 180
2x + 3x = 180
5x = 180
x = 36

<A1 = 3x = 3(36) = 108