tolong bantu no 13 makasih

1/2 x 16 x Y = 168
Y = 21

Perbandingan sumbu simetri 2 : 5
sumbu 1 panjang = 2/7 x 21 = 6
sumbu 2 panjang = 5/7 x 21 = 15

sisi miring 1
A² = 6² + 8² = 36 + 64 = 100
A = 10

sisi miring 2
B² = 15² + 8² = 225 + 64 = 289
B = 17

Keliling = 2A + 2B = 2.10 + 2.17 = 20 + 34 = 54 cm