Tolong dibantu besok dikumpulkan​

a]

AC = 8 cm

AB = 17 cm

BC^2 = AB^2 – AC^2

BC^2 = 17^2 – 8^2

BC^2 = 289 – 64

BC^2 = 225

BC = V225

BC = 15 cm

L ACBD = 2 × 1/2 × AC × BC

L ACBD = 2 × 1/2 × 8 × 15

L ACBD = 120 cm^2

b]

AC = 9 cm

BC = 12 cm

AB^2 = AC^2 + BC^2

AB^2 = 9^2 + 12^2

AB^2 = 81 + 144

AB^2 = 225

AB = V225

AB = 15 cm

L ABC = L ABC

1/2 × AC × BC = 1/2 × AB × OC

1/2 × 9 × 12 = 1/2 × 15 × OC

54 = 7,5 × OC

OC = 54/7,5

OC = 7,2 cm

OC = OD = 7,2 cm

CD = 2 × OC

CD = 2 × 7,2

CD = 14,4 cm