Pada gambar di atas, hitung panjang PS !

PR = 12
RQ = 5

PQ^2 = PR^2 + RQ^2
PQ^2 = 12^2 + 5^2
PQ^2 = 144 + 25
PQ^2 = 169
PQ = V169
PQ = 13

L segitiga PQR => 1/2 × PR × RQ = 1/2 × PQ × RS
=> 1/2 × 12 × 5 = 1/2 × 13 × RS
=> 30 = 6,5 × RS
=> RS = 30/6,5
=> RS = 4,6

PS^2 = PR^2 - RS^2
PS^2 = 12^2 - (4,6)^2
PS^2 = 144 - 21,16
PS^2 = 122,85
PS = V122,85
PS = 11,08