please kk bntu jwb ya bsok d antr tgad nya mksj

4. 180 = x + (x+21) + (x+15)
180 = 3x + 36
144 = 3x
x = 48

maka besar sudut B = 48 + 15 = 63 (C)

5. P : Q : R = 7 : 5 : 3

sudut Q = 5/15 × 180
= 60 (C)

6. A : B = 3 : 2 × 2
B : C = 4 × 1 : 5

A : B : C = 6 : 4 : 5

sudut C = 5/15 × 180
= 60 (B)

4.) x + x + 21 + x+ 15 = 180
x + x + x + 21 + 15 = 180
3x + 36 = 180
3x = 180 - 36
x = 144/3
x = 48
<B = x + 15
= 48 + 15
= 63




5.) 7 + 5 + 3 = 15
180/15 = 12

Q = 5 ×12
= 60


yg no 6 masih binggung maaf