Cho góc nhọn xOy, trên tia ax lấy điểm A, B sao cho Oa bằng 3cm , OB bằng 5cm trên tia Oy lấy điểm C, D sao cho Oc bằng Oa , Od bằng Ob. Nối AD và BC cắt nhau tại I a, chứng minh góc OAD bằng góc OCB
b, chứng minh IA bằng IC
d, chứng minh OI là tia phân giác của góc xOy

cheater

step-by-step explanation:

what are you trying to solve here

step-by-step explanation:

m=-16

step-by-step explanation:

answer:   the paragraph proof is mentioned below.

step-by-step explanation:

given: in a δxwy where

such that, ∠wzx ≅ ∠yzx and zw≅zy

we have to prove that: segment zx is a perpendicular bisector of segment wy.

prove: since, zw≅zy ⇒ ∠wzy is a supplementary angle.

then, ∠wzy= 180°

⇒∠wzx + ∠yzx = 180° ( because xz divides ∠wzy into two parts)

but, ∠wzx ≅ ∠yzx ( given)

⇒∠wzy+∠wzy=180° ( by substitution)

⇒2∠wzy=180°

⇒∠wzy=90°

⇒∠wzy=∠yzx =90°

therefore, xz⊥wy where wz=zy

⇒zx is a perpendicular bisector of wy.