allison9746
04.07.2019 •
Mathematics
Given ab, cd are diameters
prove: bd= ca
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Ответ:
Focus on the two triangles OBD and OAC. Their sides are all equal:
because they are all radii. Moreover, angles BOD and AOC are equal, because they are opposite.
So, triangles OBD and OAC have two coples of sides in common, and the angles between those sides is also congruent. Therefore, the two triangles are congruent, and in particular, AC=BD
Ответ:
1+4+7+10= 25+118=133
step-by-step explanation: