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Using Heron's formula: Area = √[s(s - a)(s - b)(s - c)], where s = (a + b + c) / 2 s = (13 + 14 + 15) / 2 = 21 Area = √[21(21 - 13)(21 - 14)(21 - 15)] = √[21 × 8 × 7 × 6] = √7056 = 84 cm²
178 168 148 ? 78 28
64, 66, 69, 74, 81, ?
What will come in place of the question mark (?) in the following series?
28, 45, 75, 118, 174, ?
43 86 258 ? 5160 30960
...156, 172, 196, ?, 268, 316
660, 653, 639, 618, 590, ?
13, 14, 23, 48, 97, 178, ?
362 452 550 656 770 892 ?
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