keliling suatu segitu sama kaki 36 cm panjang alas 10 cm brp luas segitiga

K = 36cm
s= K - alas/2
= (36 - 10) : 2
= 13cm
T² = 13² - 5²
= 169 - 25
= 144
t = √144
= 12cm

L = ½ . a . t
= ½ . 10 . 12
= 60cm²