tolong dong no 1-3 + caranya ya

1. (19-7) / 2 = 12 / 2 = 6
    Sisi miring =
    AD =√8^2 + 6^2 = √64+36 = √100 = 10
    Keliling = 10+7+10+19 = 46 (B)
2. DE = (DC-EF) /2
          = 10/2 = 5
    DC= 10+10 = 20
    sisi miring
    AD = √5^2 + 12^2 = √25+144= √169 = 13
    Keliling = 13 + 20 + 13 + 10 = 56 (B)
3. (22-10) / 2 = 6
   T= √10^2 - 6^2 = √100-36 = √64 = 8
   Luas = 1/2 x (a+b) x t
            = 1/2 x (22+10) x 8
            = 128 (B)
     

1. 19 - 7
= 12/2
=6
6² + 8² = c²
100 = c²
c = 10
kll = 7 + 19 + 10 + 10
= 46 cm (B)

2. DC - EF = 10
DC = 10 + 10
DC = 20
12² + 5² = c²
c = 13 cm
kll = 10 + 13 + 20 + 13
= 56 cm (B)

3. 6² + b² = 10²
b = 8
luas = 1/2 x t x jumlah sisi sejajar
= 1/2 x 8 x 32
= 128 cm² (B)