ituh yaka kak soalnya tolong cepet!!

a. AC=AB=BC
kel.=AC+BC+AB
=30+30+30
=90cm

b. Dik.
AB=10cm
BC=8cm
Dit.kel=?
AC=√AB^2-BC^2
AC=√10^2-8^2
AC=√100-64
AC=√36=6cm

kel.=AB+AC+BC
=10+6+8
=24cm

a.k=30+30+30=90
b.x²=10²-8²
x²=100-64
x²=36
x=6
k=6+8+10=24