Question

Luas segitiga ACD..............

Answer 1

Dik
AD = 20 cm
CD = 8 cm 
dengn Theorema phytagoras = 
AC² = AD² - CD²
AC² = 20² - 8²
AC² = 400- 64
AC  = √336
AC  = 18,33 CM

L ACD = 1/2 x a x t
          = 1/2 x 8 x 18,33
          = 1/2 x 146.64
          = 73,32 cm²