tentukan BD dan sudut CD
Jawaban:
[tex] {bd}^{2} = {ab}^{2} + {ad}^{2} \\ {bd}^{2} = {15}^{2} + {20}^{2} \\ {bd}^{2} = 225 + 400 \\ {bd}^{2} = 625 \\ bd = 25[/tex]
[tex] {cd}^{2} = {bd}^{2} - {bc}^{2} \\ {cd}^{2} = {25}^{2} - {7}^{2} \\ {cd}^{2} = 625 - 49 \\ {cd}^{2} = 576 \\ cd = 24[/tex]
