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Ascientist wants to find the radius in meters of his hemispherical dome he found that the surface area of the entire sphere containing the dome is 682 square meters which equation could he use to find the domes radius

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Of four agents alpha, beta, gamma anddelta, three have to be sent together on amission. if alpha and beta cannot gotogether, beta and gamma cannot go togetherand gamma and delta cannot go together,then which of the following holds? 1. any three agents can be sent.2. alpha, delta and any one out of beta andv gamma can be sent.3. beta, gamma and any one out of alphaand delta can be sent.4. the mission is impossible.