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d1 = 14cm
skrng cari d2 dulu
14/2= 7, sedangkang panjang sisinya 25, brrti √25^2-7^2 = √625-49=√576= 24cm, maka d2= 2*24= 48cm
maka L = 1/2 * d1 * d2 = 1/2*14*24= 168cm^2