Area of incircle of a ∆ = πr 2 =π(a/(2√3)) 2 = π((21√3)/(2√3)) 2 =π × (10.5)2 =(22/7) × 10.5 × 10.5 = 346.5 cm2
11 6 7 12 26 ? 205.5
168, 178, ?, 273, 400, 618, 963
114, 115, 118, 127, ?, 235
8, 9, 125, ?, 1331, 169
16 25 36 49 64 ?
96 89 ? 90 94 91
12, 36, 80, 164, 328, ?
150 - 10× ( 7 - 2)/4× 8 = ?
Choose the missing term.
R, U, X, A, D,?
17, 38, 123, 508, ?, 15426
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