Tolong bro nomor 3,4,7 ama 8,tulisin ya bro jawabannya

3. lambang siku-siku berarti 90°
maka :
180 = 90 + x + y
x + y = 90

4. x + 32 = 2x- 8 (karena sama kaki)
40° = x
sudut DEF = (2 x 40°)- 8
= 80 - 8
= 72°

7. 180 - 145 = 35°
180 = 35 + 85 + 2x + 20
180 = 140 + 2x
20° = x

x-15 = 20 - 15
= 5°

8. 180 - 108 = 72°

180 = 36 + 72 + sudut CAB
180 = 108 + sudut CAB
72° = sudut CAB