Tplong bantu sekarang ka​

Jawaban:

Nomor 3

a). Cos 45° = AB/AC

0,5√2 = AB/10

AB = 5 √2 cm.

b). Luas ABCD = ( 5 √2)^2 = 50 cm^2

c). Keliling ABCD = 4 x 5 √2 = 20 √2 cm