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180=2a+4a+60
180-60=6a
120/6=a
20=a
nilai b
360=90+96+54+5b
360-240=5b
120/5=b
b= 24
b.sudut ABD= 4a+60 =4(20)+60=140
sudut CBD=2a=2(20)=40
sudut PQS=5b=5(24)=120
sudut RQP= 90+54= 144
3.a. nilai x⇒ 90=24+3x
90-24=3x
66/3=x
22=x
nilai y⇒90=7y+20
90-20=7y
70/7=y
y=10
b. sudut FEG=3x=3(22)= 66
sudut SQT=7y= 7(10)=70
4. 90= 2 ·sudut P
3
90×3 = sudut P
2
135=sudut P
5.a. nilai x
180=5x + (3x-20)
180= 5x + 3x - 20
180+20= 8x
200/8=x
x=25
b. BOC= 3x-20= 3(25)-20=75-20=55
6.90= 2×sudut A
90/2=sudut A
sudut A=45
7.besar sudut = 32+90=122
8. gak tau
9. 90= 7x+8x
90=15x
90/15=x
x=6
besar sudutnya (7×6),(8×6)⇒42,dan 48
10.