cde面積知識大全

Ⅰ 奼備笁瑙掑艦cde鐨勯潰縐

涓夎掑艦ABE=3騫蟲柟鍘樼背
AB=4cm
S=AB*ab錛堜笁瑙掑艦楂樺害錛/2
3=4*ab/2
ab=1.5cm

鐢盿,b,c,d,e涓虹瓑楂樺鉤琛屽彲寰椾笁瑙掑艦CED楂榖e=4.5cm

CDE闈㈢Н=S=CD*be/2
=12*4.5/2
=27騫蟲柟鍘樼背