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* segitiga psr
<s = <r = 65'
<p = 180 - <s - <r
<p = 180 - (65 x 2)
<p = 180 - 130 = 50'
* segtiga prq
<r = 180 - 65 (karena, sudut r berada pada garis lurus, sehingga jumlah sudutnya 180')
<r = 115
< p = < q = (180-115) : 2
<p = < q = 65 : 2
<p = <q = 32,5'
* maka, total besar sudut p = 50' + 32,5' = 82,5'