1276. The area of sector of a circle whose radius is 12 metro and whose angle at the center is 42 is?
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A. 26.4 m<sup>2</sup>

B. 39.6 m<sup>2</sup>

C. 52.8 m2

D. 79.2 m<sup>2</sup>

1278. 52 * 40.1 = ________?
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A. 2080

B. 2380

C. 2480

D. 2260

1286. If (4<sup>61
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A. 11

B. 13

C. 3

D. None of these
1293. If the diagonal of a square is doubled. How does the area of the square change?
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A. Becomes fourfold

B. Becomes twofold

C. Becomes threefold

D. none of the above