perhatikan gambar disamping, maka panjang bc adalah..... a. 12cm b. 13cm c. 15cn d. 17cm

BE^2= AE^2-AB^2
BE^2= 25^2-20^2
BE^2= 625-400
BE^2= 225
BE= 15cm

EC^2= ED^2-DC^2
EC^2= 10^2-6^2
EC^2= 100-36
EC^2= 64
EC= 8cm

BC^2= BE^2+EC^2
BC^2= 15^2+8^2
BC^2= 225+64
BC^2= 289
BC= 17cm (d)