tolong jawab nomer 5 dan 8. pakai cara. Mohon Bantuannya. Terima Kasih(:

jawab

5. 
pitagoras
x² = 26² -10²
x² = 676 - 100
x²= 576
x = 24

8. 
AB= 3
BC = 4
CD = 12

AC² = (AB²+BC²)
AC² = 3² + 4² = 25
AC = √25
AC = 5

AD² = AC² + CD²
AD² = 5² + 12² = 169
AD = √169
AD = 13

Keliling ABCD = AB + BC + CD + AD = 
K = 3 + 4 + 12 + 13
K = 32