kak tolong jawab peetanyaan ku kak, pake cara kak, no 24

jumlah sudut segitiga = <A + <B + <C = 180
karena AB = BC, maka 2×<A + <B = 180
2 × 3/4 <B + <B = 180
5/2 <B = 180
<B = 180 × 2 ÷ 5 = 72