Tolongin kakak…….
Penjelasan dengan langkah-langkah:
penjelasan pada foto, trimakasih..
Jawab:
- x= 19, ∠RQS= 85°
- x= 15, ∠ABD= 105°
- y= 18, ∠AED= 73°
Penjelasan dengan langkah-langkah:
1. 180 = 5x + 4x + 9
180 = 9x + 9
180 – 9 = 9x
171 = 9x
= x
x = 19
∠RQS= 4x + 9
= 4(19) + 9
= 76 + 9
= 85°
2. 180 = 7x + 5x
180 = 12x
= x
x = 15
∠ABD= 7x
= 7(15)
= 105°
3. 107 = 5y + 17
107 – 17 = 5y
90 = 5y
= y
y = 18
∠AED= 180° – 107°
= 73°