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This activity was created by '{$1}'. Do you want to modify the original activity or create your own copy instead?
This activity was created by '{$1}' and you lack the permission to edit it. Do you want to create your own copy instead and add it to the book?
Hình thang vuông
Hình thang vuông là hình thang có một góc vuông
Vẽ hình thang ABCD vuông tại A.
Di chuyển các đỉnh của hình thang, quan sát hình