cho hình thang ABCD, AB//CD, có các tia phân giác của các góc A và góc D cắt nhau tại I thuộc cạnh bên BC, chứng minh rằng AD bằng tổng của 2 đáy

you need to show the graph

step-by-step explanation:

answer: 20

step-by-step explanation:

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°

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