∠𝑎
∠𝑎
∠𝑏
∠𝑏
∠𝑎 + ∠𝑏= 900
∠𝑎 ∠𝑏 ∠𝑏 = 1800
∠𝑎 = ∠𝑐
∠𝑎 +
∠𝑏 = ∠𝑑
̅̅̅̅ 𝐴𝐵
̅̅̅̅ 𝐶𝐷
𝑥𝑒𝑦
𝑥+𝑦
130
𝑦 = 130
130
𝑥 + 𝑦 = 130 50
𝑥+
𝑥 + 𝑦 = 130 𝑥 − 4𝑦 = 50
4𝑥 + 4𝑦 = 520 𝑥 − 4𝑦 = 50 5𝑥 = 570 𝑥=
570 = 114 5 𝑥 = 14
𝑥=
𝑦 𝑥 + 𝑦 = 130 114 + 𝑦 = 130 𝑦 = 130 − 114 𝑦 = 16