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QuestionIf given area and length of a rectangle, how do I find the perimeter?
DonaganTop AnswererDivide the area by the length, giving you the width. Add twice the width to twice the length. -
QuestionWhat's the perimeter of a triangle that has sides of 2/3, 2/5 and 2/3?
DonaganTop AnswererAdd the three sides together: 2/3 + 2/5 + 2/3 = 10/15 + 6/15 + 10/15 = 26/15 = 1 11/15.
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QuestionThe perimeter of a rectangle is 64 feet. Length is 7 feet less than 2 times the width. What are the dimensions of the rectangle?
DonaganTop AnswererLet x = the width. Then the length is 2x - 7. The perimeter is twice the width plus twice the length: 64 = (2x) + 2(2x - 7) = (2x) + (4x - 14) = 6x - 14. So 64 = 6x - 14, and 78 = 6x. Then x = 13 ft, and the length is (2)(13) - 7 = 26 - 7 = 19 ft. To check: (2)(13) + (2)(19) = 26 + 38 = 64.
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QuestionAn uniunit square has its corners chopped off to from a regular polygon with eight sides. What is the area of this polygon?
Community AnswerSplit the polygon into two trapezoids and a rectangle. Find the area of the three shapes, and add them up, that's the area. -
QuestionHow do I find the perimeter of a triangle with sides (2x + 3), (x + 4), and (x - 1)?
I_l1ke_gam3sCommunity AnswerAdd the sides together: (2x + 3) + (x + 4) + (x - 1) = 4x + 6 units.
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