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QB = √8² - 4²
QB = √64 - 16
QB = √48
QB = 4√3cm
15) K = 15+15+18/2 = 24
L = √24(24-15)+(24-15)+(24-18)
L = √24x9x9x6
L = √11664 = 108cm²
16) jarak = √(-20-20)² + (-30-30²
jarak = √ 1600+ 3600
jarak = √5200
jarak = 20√13
17) cari lebar
Lebar = √25² - 20²
lebar = √625 -400
lebar = √225
lebar = 15cm
luas = pxl
luas = 20 x 15 = 300cm²
By ; MASTER Online