Yg nomer 2 kak U_U
Cefatt
2.
a) K = 26 + 40 + 2.t
^cari t ;
t = √24² + ((40:2) – (26:2))²
= √24² + (20 – 13)²
= √24² + 7²
= √576 + 49
= √625
t = 25 cm
K = 26 + 40 + 2.t
= 66 + 2(25)
= 66 + 50
K = 116 cm
b) K = 5 + 20 + x + y
^cari x dan y
x = √5² + 12²
= √25 + 144
= √169
x = 13 cm
y = √20² – 12²
= √400 – 144
= √256
y = 16 cm
K = 5 + 20 + x + y
= 5 + 20 + 13 + 16
= 25 + 29
K = 54 cm