Diketahui trapesium siku-siku ABCD, Siku-Siku di A, AB//CD,BC=Diagonal, AC=15 cm,CD=9 cm ; AB=18 cm. Luas trapesium ABCD adalah?
a. 164cm persegi (cm pangkat2)
b. 162cm persegi
c. 160cm persegi
d. 168cm persegi
jawab pakai cara yah thx
a. 164cm persegi (cm pangkat2)
b. 162cm persegi
c. 160cm persegi
d. 168cm persegi
jawab pakai cara yah thx
Verified answer
TRAPESIUM SIKU-SIKU ABCDSiku-siku di A
AB//CD
BC = Diagonal = AC = 15 cm
CD = 9 cm
AB = 18 cm
L = ...???
t^2 = AC^2 - (1/2 × AB)^2
t^2 = 15^2 - (1/2 × 18)^2
t^2 = 15^2 - 9^2
t^2 = 225 - 81
t^2 = 144
t = akar 144
t = 12 cm
L = 1/2 × (AB+ CD) × t
L = 1/2 × (18 + 9) × 12
L = 1/2 × 27 × 12
L = 162 cm^2 (b)