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чотирикутники

8 клас

QuestionAnswer
Якщо О – точка перетину діагоналей прямокутника АВСD, то трикутник АОВ - … (1 бал) рівносторонній;
Якщо периметр паралелограма АВСD дорівнює 26 см, а довжина сторони АВ дорівнює 5 см, то довжина сторони ВС дорівнює … (1 бали) 8 см
Якщо кут М паралелограма MNKL дорівнює 30º, то кут N дорівнює … (1 бал) 150º
Обчислити кути ромба, якщо його периметр дорівнює 24 см, а висота – 3 см. (2 бали) 60º, 120º
Якщо кут А паралелограма АВСD дорівнює 120º, то кут В дорівнює ... (1 бал) 60º.
Якщо бісектриса АК кута А прямокутника АВСD поділяє сторону ВС на відрізки ВК=5 см, КС=6 см, то периметр прямокутника АВСD дорівнює … (2 бали) 32 см.
У ромбі висота, проведена з вершини тупого кута, ділить сторону ромба пополам. Знайти кути ромба. (2 бали) 60º, 120º
Created by: svmajaka
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