bantu tugas matematika kelas 1 SMA jawab dengan benar !!!

s1 = (4+V2) cm
s2 = (4+V2) cm
s3 = (8-2V2) cm

segitiga sama kaki , maka :
a]
t^2 = (s1)^2 - (1/2(s3))^2
t^2 = (4+V2)^2 - (1/2(8-2V2))^2
t^2 = (4+V2)^2 - (4-V2)^2
t^2 = 16+8V2+2 - (16-8V2+2)
t^2 = 16+8V2+2 - 16+8V2-2
t^2 = 16V2
t^2 = V(256×2)
t^2 = V512
t^2 = V(2^9)
t^2 = (2^9)^1/2
t^2 = 2^9/2
t = (2^9/2)^1/2
t = (2^9/4) cm

b]
K = s1 + s2 + s3
K = (4+V2) + (4+V2) + (8-2V2)
K = 8 + 2V2 + 8 - 2V2
K = 16 cm

c]
L = 1/2 × s3 × t
L = 1/2 × (8-2V2) × 2^9/4
L = (4-V2) × (2^9/4)
L = (2^2 - 2^1/2) × (2^9/4)
L = (2^17/4 - 2^11/4) cm^2