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= 1/2 × 90
= 45cm
luas segitiga = 1/2 × 40 × 9
= 1/2 × 360
= 180
jari jari = luas/sisi
= 180/45
=4cm
klo slah maaf yaa....
= 1/2 x 90
= 45cm
L Segitiga = 1/2 x 40 x 9
= 1/2 x 360
= 180
r = L/S
= 180/45
= 4 cm