Luas segitiga sama kaki 240 cm2, panjang alasnya 20 cm, berapa kelilingnya ?
5dregensleyer
Luas = 1/2 x a x t 240 = 1/2 x 20 x t 240 = 10 x t 240/10 = t 24 = t panjang a pada alas a = 1/2 x 20 = 10 panjang sisi miring s = √ t² + a² = √24² + 10² = √576 + 100 = √676 = 26 cm kliling = 2(s) + alas =2(26) + 20 = 52 + 20 = 72 cm
240 = 1/2 x 20 x t
240 = 10 x t
240/10 = t
24 = t
panjang a pada alas
a = 1/2 x 20
= 10
panjang sisi miring
s = √ t² + a²
= √24² + 10²
= √576 + 100
= √676
= 26 cm
kliling = 2(s) + alas
=2(26) + 20
= 52 + 20
= 72 cm
jawabannya adaah 72 cm