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d = 21 cm ----> r = 1/2 x d
= 1/2 x 21
= 10,5 cm
Maka,
L = 4 x x r²
L = 4 x 22/7 x 10,5²
L = 4 x 22/7 x 110,25
L = 1.386 cm²
Jadi, Luasnya adalah 1.386 cm² (JAWABAN D)
7 2 2
= 2 * 11 * 3 * 21
= 1386cm2 (D)