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√25² - 20²
(=) √625 - 400
(=) √225
(=) 15 cm
Panjang BD = 15 cm
Lalu gunakan pitagoras untuk segitiga yang kecil
√15² - 9²
(=) √225 - 81
(=) √144
(=) 12 cm
sinα / a = sinβ / b
sin90 / 4 = sin(180-(90+60)/b
1 / 4 = sin30 / b
1 / 4 = (1/2) / b
b = 2 cm