Tolong di jawab pls​

4)a.5x-8=2x+10

5x-2x=10+8

3x=18

x=18:3

=6 cm

b. diagonal AC= 5x-8

=5.6-8

=30-8

=22 cm

diagonal BD=2x+10

=22 cm

jumlah:22cm+22cm=44 cm