Ответ:
Объяснение:
1) АС=√(AB²+BC²-2AB*BC*cos135°) = √(6²+(3√2)²-2*6*3√2 * (-√2/2)) =
= √(36+18+2*6*3)=√90 = 3√10 см
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2) S=1/2(AB*AC*sin45°) = 1/2(4*6*√2/2) = 1/2*12√2 = 6√2 см².
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Ответ:
Объяснение:
1) АС=√(AB²+BC²-2AB*BC*cos135°) = √(6²+(3√2)²-2*6*3√2 * (-√2/2)) =
= √(36+18+2*6*3)=√90 = 3√10 см
*****************
2) S=1/2(AB*AC*sin45°) = 1/2(4*6*√2/2) = 1/2*12√2 = 6√2 см².