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BC= PR = 8 cm(sisi datar)
QR=AC= 10 cm (sisi miring)
untuk nyari PQ(sisi tegak), pake theorema phytagoras
→PQ^2 = QR^2 - PR^2
PQ^2 = 10^2 - 8^2
PQ^2 = 100 - 64
PQ^2 = 36
PQ = √36
PQ = 6 cm
(ps: ^ artinya pankat, √artinya akar)
Luas = 1/2 x alas x tinggi
= 1/2 x 8cm x 6cm
= 24 cm^2 (a)