yg baik hati tolong jawab dua duanya,, pake jalan!mksihh

7. segitiga abc = 10×10÷2 = 50
bc= akar(10^2+10^2)= 10akar2
50×2=100÷10akar2 = 5akar2 = a

8. 180-50 = 130÷2 = 65
65÷2= 32.5
180-32.5-32.5 = 115 (b)