Ⅰ 姹备笁瑙掑舰cde镄勯溃绉
涓夎掑舰ABE=3骞虫柟铡樼背
AB=4cm
S=AB*ab锛堜笁瑙掑舰楂桦害锛/2
3=4*ab/2
ab=1.5cm
鐢盿,b,c,d,e涓虹瓑楂桦钩琛屽彲寰椾笁瑙掑舰CED楂榖e=4.5cm
CDE闱㈢Н=S=CD*be/2
=12*4.5/2
=27骞虫柟铡樼背
Ⅰ 姹备笁瑙掑舰cde镄勯溃绉
涓夎掑舰ABE=3骞虫柟铡樼背
AB=4cm
S=AB*ab锛堜笁瑙掑舰楂桦害锛/2
3=4*ab/2
ab=1.5cm
鐢盿,b,c,d,e涓虹瓑楂桦钩琛屽彲寰椾笁瑙掑舰CED楂榖e=4.5cm
CDE闱㈢Н=S=CD*be/2
=12*4.5/2
=27骞虫柟铡樼背