tolong jawab no 3,4, dan 5

3. AD^2 = AB × AC
6^2 = AB × 12
36 = AB × 12
AB = 36/12 = 3cm

4. DC/AC = DE/AB
14/28 = 17/AB
1/2 = 17/AB
AB = 34 cm

5. a. DG^2 = EG × GF
8^2 = 5 × GF
64 = 5 × GF
GF = 64/5 = 12,8cm

b. L = a×t/2
L = 17,8 × 8/2
L = 17,8 × 4
L = 71,2 cm^2