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Verified answer
Luas Juring = sudut pusat/360 x πr²90/360 x 22/7 x 21 x 21
1/4 x 22 x 3 x 21
= 1/4 x 66 x 21
= 1/4 x 1386
= 346,5 cm²
Jadi, luas juring memiliki jari-jari 21 cm dan besar sudut pusatnya 90° adalah 346,5 cm²
Semoga Bermanfaat :)