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Math Help - Triangles

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    Unhappy Triangles

    I need help with how you make a two column proof for line segment PR = line segment PQ, and QR is greater then QP proove m < P is greater than m<Q Please explain in detail
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    Quote Originally Posted by cassandraphillips75 View Post
    I need help with how you make a two column proof for line segment PR = line segment PQ, and QR is greater then QP proove m < P is greater than m<Q Please explain in detail
    Draw the triangle PQR. Then draw a segment (PD) from P to QR such that RS is congruent to PR. From the base angles theorem you know that m<RDP = m<RPD. Because m<P = m<RPD + m<DPQ, you know that m<P = m<RDP + m<DPQ. Therefore m<P > m<RDP.

    From the base angles theroem, you know that m<RDP = m<DPC + m<Q and therfore that m<RDP > m<Q (this idea is the exterior angle inequality theorem). Finally, because m<P > m<RDP and m<RDP > m<Q, you can conclude m<P > m<Q.

    So there is the paragraph proof. I'll leave it for you to put the statements and reasons into a two-column format.
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