The word “twice” indicates multiplication by 2.
The word “sum” indicates the symbol “ ”.
The word twice the sum of two adjacent sides a and b indicates .
Rewrite the sentence into expression as
The perimeter of a parallelogram is .
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”.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=af6e4af871b0449ed263913f295ea4c9.png\")
.![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
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.