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untuk mencari keliling harus mencari sisi dulu
sisi = 15^2 + 8^2
= 225 + 16
=√289
= 17
keliling = sisi x 4
= 17 x 4
= 68
QS=16-›16/2=8
PR=30-›30/2=15
Mencari sisi miring
RS=√8²+15²
=√64+225
=√289=17cm
Jadi kelilingnya
Kel=4*sisi
=4*17= 68cm
Semoga membantu